/* ==========================================================================
   亿德体育看台 · 共享样式 /assets/site.css
   结构：reset → 变量 → 中文排版 → 外壳 → 页头 → 页脚 → 通用组件 → 响应式 → 动效降级
   ========================================================================== */

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 10rem;
}

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

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

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

button { font: inherit; color: inherit; background: none; border: 0; }

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

address { font-style: normal; }

table { border-collapse: collapse; }

/* ---------- 变量 ---------- */
:root {
  --ink-green: #0B2B26;
  --night-blue: #0E1F3D;
  --ink-black: #07111F;
  --stand-cream: #F4F0E6;
  --lime: #A8FF3E;
  --whistle: #FF6B35;
  --wine: #7A1F3D;
  --indigo: #3A2E6E;
  --paper: #E8D8A6;
  --fog: #8FA89B;
  --paper-deep: #E9E2D1;

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

  --shell: 1220px;
  --gutter: clamp(1.05rem, 4vw, 3.25rem);
  --shadow-hard: 8px 8px 0 var(--ink-black);
  --line-cream: rgba(244, 240, 230, 0.18);
  --line-cream-strong: rgba(244, 240, 230, 0.36);
  --stripe: linear-gradient(90deg,
    var(--lime) 0 16%,
    var(--ink-black) 16% 22%,
    var(--whistle) 22% 34%,
    var(--wine) 34% 44%,
    var(--indigo) 44% 58%,
    var(--night-blue) 58% 78%,
    var(--lime) 78% 100%);
}

/* ---------- 中文排版与基础 ---------- */
html, body { height: 100%; }

body {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: clamp(1rem, 0.96rem + 0.22vw, 1.06rem);
  line-height: 1.85;
  letter-spacing: 0.01em;
  background: var(--stand-cream);
  color: var(--ink-green);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

h1 { font-size: clamp(2rem, 1.45rem + 3.2vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 1.2rem + 1.6vw, 2.3rem); }
h3 { font-size: clamp(1.14rem, 1.04rem + 0.55vw, 1.4rem); }
h4 { font-size: 1rem; letter-spacing: 0.02em; }

::selection { background: var(--lime); color: var(--ink-black); }

:where(button, a, [role="button"]):focus-visible {
  outline: 3px solid var(--lime);
  outline-offset: 3px;
}

.yd-main {
  flex: 1 0 auto;
  display: block;
}

/* ---------- 外壳 ---------- */
.yd-shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.yd-band { padding-block: clamp(2.4rem, 6vw, 4.6rem); }
.yd-band--green { background: var(--ink-green); color: var(--stand-cream); }
.yd-band--night { background: var(--night-blue); color: var(--stand-cream); }
.yd-band--dark { background: var(--ink-black); color: var(--stand-cream); }
.yd-band--wine { background: var(--wine); color: var(--stand-cream); }
.yd-band--indigo { background: var(--indigo); color: var(--stand-cream); }
.yd-band--paper { background: var(--stand-cream); color: var(--ink-green); }
.yd-band--paper-deep { background: var(--paper-deep); color: var(--ink-green); }

.yd-kicker {
  display: inline-block;
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--fog);
  margin-bottom: 0.6rem;
}

.yd-section-title {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.5rem, 1.2rem + 1.6vw, 2.2rem);
  line-height: 1.16;
  letter-spacing: -0.02em;
}

.yd-lede {
  max-width: 34em;
  margin-top: 0.85rem;
  line-height: 1.9;
}

.yd-num {
  font-family: var(--font-num);
  letter-spacing: 0.06em;
}

/* 12 栏网格 */
.yd-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1rem, 2.4vw, 2rem);
}
.yd-col-4 { grid-column: span 4; }
.yd-col-5 { grid-column: span 5; }
.yd-col-6 { grid-column: span 6; }
.yd-col-7 { grid-column: span 7; }
.yd-col-8 { grid-column: span 8; }
.yd-col-12 { grid-column: 1 / -1; }

/* ---------- 跳转与滚动进度 ---------- */
.yd-skip {
  position: fixed;
  top: 0.4rem;
  left: 0.4rem;
  z-index: 300;
  transform: translateY(-180%);
  padding: 0.7rem 1.1rem;
  background: var(--lime);
  color: var(--ink-black);
  font-weight: 800;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  border: 3px solid var(--ink-black);
  box-shadow: 4px 4px 0 var(--ink-black);
  transition: transform 0.18s ease;
}
.yd-skip:focus,
.yd-skip:focus-visible { transform: translateY(0); }

.yd-progress {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  height: 6px;
  z-index: 200;
  pointer-events: none;
  background: rgba(7, 17, 31, 0.55);
}
.yd-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--lime), var(--whistle));
  box-shadow: 0 0 12px rgba(168, 255, 62, 0.6);
}

/* ---------- 页头 ---------- */
.yd-header {
  position: sticky;
  top: 0;
  z-index: 120;
  color: var(--stand-cream);
  background:
    radial-gradient(120% 90% at 50% -30%, rgba(168, 255, 62, 0.16), transparent 62%),
    var(--ink-green);
  border-bottom: 4px solid var(--ink-black);
}

.yd-header__stripe {
  height: 6px;
  background: var(--stripe);
}

.yd-header__inner { padding-block: 0.95rem 0.6rem; }

.yd-masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 0.7rem 1.5rem;
}

.yd-masthead__kicker {
  font-family: var(--font-num);
  font-size: 0.68rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--fog);
  white-space: nowrap;
}

.yd-brand {
  justify-self: center;
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.25rem 0.5rem;
  border: 3px solid transparent;
  transition: border-color 0.16s ease;
}
.yd-brand:hover,
.yd-brand:focus-visible { border-color: var(--lime); }

.yd-brand__mark {
  display: inline-flex;
  align-items: flex-end;
  gap: 4px;
  height: 1.7rem;
}
.yd-brand__led {
  display: block;
  width: 6px;
  font-style: normal;
  background: var(--lime);
  border-radius: 1px;
  box-shadow: 0 0 10px rgba(168, 255, 62, 0.75);
}
.yd-brand__led:nth-child(1) { height: 42%; }
.yd-brand__led:nth-child(2) { height: 72%; }
.yd-brand__led:nth-child(3) { height: 100%; }

.yd-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}
.yd-brand__name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.2rem, 1.02rem + 0.75vw, 1.72rem);
  letter-spacing: 0.06em;
}
.yd-brand__sub {
  margin-top: 0.35rem;
  font-family: var(--font-num);
  font-size: 0.6rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--fog);
}

.yd-masthead__side {
  justify-self: end;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.yd-utility-link {
  display: inline-block;
  padding: 0.42rem 0.7rem;
  border: 2px solid var(--line-cream-strong);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--stand-cream);
  white-space: nowrap;
  transition: background 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}
.yd-utility-link:hover,
.yd-utility-link:focus-visible {
  background: rgba(244, 240, 230, 0.1);
  border-color: var(--lime);
  color: var(--lime);
}
.yd-utility-link--accent {
  background: var(--whistle);
  color: var(--ink-black);
  border-color: var(--ink-black);
  box-shadow: 3px 3px 0 var(--ink-black);
}
.yd-utility-link--accent:hover,
.yd-utility-link--accent:focus-visible {
  background: var(--lime);
  color: var(--ink-black);
  border-color: var(--ink-black);
}

.yd-nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.42rem 0.7rem;
  border: 2px solid var(--lime);
  color: var(--lime);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  cursor: pointer;
}
.yd-nav-toggle:hover,
.yd-nav-toggle:focus-visible { background: rgba(168, 255, 62, 0.12); }
.yd-nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}
.yd-nav-toggle__bars span {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.yd-header[data-open] .yd-nav-toggle__bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.yd-header[data-open] .yd-nav-toggle__bars span:nth-child(2) { opacity: 0; }
.yd-header[data-open] .yd-nav-toggle__bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.yd-nav-toggle__text {
  font-family: var(--font-num);
  letter-spacing: 0.16em;
}

.yd-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 1.7rem;
  margin-top: 0.9rem;
  padding-block: 0.5rem;
  border-top: 1px solid var(--line-cream);
  border-bottom: 1px solid var(--line-cream);
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fog);
}
.yd-meta__item {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding-block: 0.15rem;
}
.yd-meta__num {
  color: var(--lime);
  letter-spacing: 0.08em;
}

.yd-nav { margin-top: 0.5rem; }
.yd-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.15rem 0.3rem;
}
.yd-nav__item { display: block; }
.yd-nav__link {
  position: relative;
  display: block;
  padding: 0.68rem 0.95rem 0.72rem;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--stand-cream);
  border-bottom: 3px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease, background 0.16s ease;
}
.yd-nav__link:hover,
.yd-nav__link:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}
.yd-nav__link[aria-current="page"] {
  color: var(--ink-black);
  background: var(--lime);
  border-bottom-color: var(--ink-black);
}

/* ---------- 页脚 ---------- */
.yd-footer {
  background: var(--ink-black);
  color: var(--stand-cream);
  border-top: 6px solid var(--ink-green);
}
.yd-footer__stripe {
  height: 6px;
  background: var(--stripe);
}
.yd-footer__inner {
  padding-block: clamp(2.2rem, 5vw, 3.6rem) 1.3rem;
}
.yd-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.25fr;
  gap: clamp(1.4rem, 3vw, 2.6rem);
  align-items: start;
}
.yd-footer__brand { min-width: 0; }
.yd-footer__logo {
  display: inline-block;
  padding-bottom: 0.5rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: 0.08em;
  border-bottom: 3px solid var(--lime);
}
.yd-footer__logo:hover,
.yd-footer__logo:focus-visible { color: var(--lime); }
.yd-footer__tagline {
  margin-top: 0.9rem;
  max-width: 22em;
  font-size: 0.95rem;
  color: rgba(244, 240, 230, 0.86);
}
.yd-footer__note {
  margin-top: 0.55rem;
  max-width: 24em;
  font-size: 0.8rem;
  line-height: 1.75;
  color: var(--fog);
}
.yd-footer__col { min-width: 0; }
.yd-footer__title {
  margin-bottom: 0.85rem;
  font-family: var(--font-num);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--lime);
}
.yd-footer__list { display: grid; gap: 0.5rem; }
.yd-footer__link {
  display: inline-block;
  padding-block: 0.12rem;
  font-size: 0.92rem;
  color: rgba(244, 240, 230, 0.85);
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}
.yd-footer__link:hover,
.yd-footer__link:focus-visible {
  color: var(--lime);
  border-bottom-color: var(--lime);
}
.yd-footer__contact {
  display: grid;
  gap: 0.12rem;
  font-size: 0.88rem;
}
.yd-footer__contact dt {
  margin-top: 0.5rem;
  font-family: var(--font-num);
  font-size: 0.64rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fog);
}
.yd-footer__contact dd {
  margin: 0;
  color: rgba(244, 240, 230, 0.9);
  word-break: break-word;
}
.yd-footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.55rem 1.5rem;
  margin-top: clamp(1.6rem, 4vw, 2.6rem);
  padding-top: 1.1rem;
  border-top: 1px solid var(--line-cream);
  font-family: var(--font-num);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--fog);
}
.yd-footer__copy { font-size: 0.74rem; }
.yd-footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem 1.1rem;
}
.yd-footer__legal .yd-footer__link { font-size: 0.74rem; }
.yd-footer__icp {
  font-family: var(--font-num);
  letter-spacing: 0.08em;
  color: rgba(244, 240, 230, 0.72);
}

/* ---------- 按钮 ---------- */
.yd-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.15rem;
  background: var(--stand-cream);
  color: var(--ink-black);
  border: 3px solid var(--ink-black);
  box-shadow: 5px 5px 0 var(--ink-black);
  font-weight: 800;
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: transform 0.16s ease, box-shadow 0.16s ease, background 0.16s ease;
}
.yd-btn:hover,
.yd-btn:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 var(--ink-black);
}
.yd-btn--whistle { background: var(--whistle); color: var(--ink-black); }
.yd-btn--lime { background: var(--lime); color: var(--ink-black); }
.yd-btn--ghost {
  background: transparent;
  color: var(--stand-cream);
  border-color: var(--stand-cream);
  box-shadow: 5px 5px 0 rgba(244, 240, 230, 0.24);
}
.yd-footer .yd-btn { margin-top: 1.1rem; }

/* ---------- 面包屑 ---------- */
.yd-breadcrumb {
  padding-block: 1rem 0.2rem;
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fog);
}
.yd-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.2rem 0.1rem;
}
.yd-breadcrumb li { display: flex; align-items: center; gap: 0.5rem; }
.yd-breadcrumb li + li::before {
  content: "/";
  color: rgba(143, 168, 155, 0.65);
}
.yd-breadcrumb a:hover,
.yd-breadcrumb a:focus-visible { color: var(--lime); }
.yd-breadcrumb--on-light { color: #55665d; }
.yd-breadcrumb--on-light a:hover,
.yd-breadcrumb--on-light a:focus-visible { color: var(--wine); }

/* ---------- 检索 chips ---------- */
.yd-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.yd-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.48rem 0.9rem;
  background: var(--stand-cream);
  color: var(--ink-black);
  border: 2px solid var(--ink-black);
  box-shadow: 3px 3px 0 var(--ink-black);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: background 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
}
.yd-chip:hover,
.yd-chip:focus-visible { transform: translate(-1px, -1px); }
.yd-chip[aria-pressed="true"] {
  background: var(--lime);
  box-shadow: 3px 3px 0 var(--whistle);
}
.yd-chip--dark {
  background: transparent;
  color: var(--stand-cream);
  border-color: var(--line-cream-strong);
  box-shadow: none;
}
.yd-chip--dark:hover,
.yd-chip--dark:focus-visible {
  border-color: var(--lime);
  color: var(--lime);
  transform: none;
}
.yd-chip--dark[aria-pressed="true"] {
  background: var(--lime);
  color: var(--ink-black);
  border-color: var(--ink-black);
  box-shadow: 3px 3px 0 var(--whistle);
}
.yd-filter-count {
  font-family: var(--font-num);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--fog);
}

/* ---------- 清单轨道 ---------- */
.yd-track {
  border-top: 3px solid var(--track-line, var(--ink-green));
}
.yd-track__row {
  display: grid;
  grid-template-columns: 5.5rem minmax(0, 1fr) auto;
  align-items: start;
  gap: 0.5rem 1.1rem;
  padding: 1rem 0.3rem;
  border-bottom: 1px solid var(--track-line-soft, rgba(11, 43, 38, 0.22));
  transition: background 0.16s ease;
}
.yd-track__row:hover { background: var(--track-hover, rgba(232, 216, 166, 0.35)); }
.yd-track__index {
  font-family: var(--font-num);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--track-index, var(--wine));
}
.yd-track__body { display: grid; gap: 0.3rem; min-width: 0; }
.yd-track__meta {
  font-family: var(--font-num);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--track-meta, #5c6f66);
  white-space: nowrap;
}
.yd-track--on-dark {
  --track-line: rgba(244, 240, 230, 0.34);
  --track-line-soft: rgba(244, 240, 230, 0.16);
  --track-index: var(--lime);
  --track-meta: var(--fog);
  --track-hover: rgba(168, 255, 62, 0.08);
  color: var(--stand-cream);
}

/* ---------- 档案卡 ---------- */
.yd-card {
  position: relative;
  padding: clamp(1.1rem, 2.4vw, 1.7rem);
  background: var(--stand-cream);
  color: var(--ink-green);
  border: 3px solid var(--ink-black);
  box-shadow: var(--shadow-hard);
}
.yd-card--paper { background: var(--paper); }
.yd-card--dark {
  background: var(--night-blue);
  color: var(--stand-cream);
  border-color: var(--lime);
  box-shadow: 8px 8px 0 rgba(7, 17, 31, 0.75);
}
.yd-card__index {
  display: inline-block;
  margin-bottom: 0.6rem;
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--wine);
}
.yd-card--dark .yd-card__index { color: var(--lime); }

/* ---------- 标签 ---------- */
.yd-label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.22rem 0.5rem;
  background: var(--paper);
  color: var(--ink-black);
  border: 2px solid var(--ink-black);
  font-family: var(--font-num);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.yd-label--lime { background: var(--lime); }
.yd-label--orange { background: var(--whistle); }
.yd-label--wine {
  background: var(--wine);
  color: var(--stand-cream);
  border-color: var(--stand-cream);
}
.yd-label--ghost {
  background: transparent;
  color: var(--fog);
  border-color: rgba(143, 168, 155, 0.55);
}

/* ---------- 图像容器 ---------- */
.yd-media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 3px solid var(--ink-black);
  box-shadow: var(--shadow-hard);
  background:
    repeating-linear-gradient(135deg, rgba(168, 255, 62, 0.16) 0 12px, transparent 12px 24px),
    linear-gradient(160deg, var(--night-blue), var(--ink-green));
}
.yd-media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.yd-media--wide { aspect-ratio: 21 / 9; }
.yd-media--portrait { aspect-ratio: 3 / 4; }
.yd-media--square { aspect-ratio: 1 / 1; }
.yd-media__tag {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 0.32rem 0.6rem;
  background: var(--lime);
  color: var(--ink-black);
  border-top: 2px solid var(--ink-black);
  border-right: 2px solid var(--ink-black);
  font-family: var(--font-num);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

/* ---------- 显现与筛选状态 ---------- */
.yd-reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.yd-reveal.is-in {
  opacity: 1;
  transform: none;
}
[data-filter-item][hidden] { display: none !important; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .yd-footer__grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 7rem; }

  .yd-masthead {
    grid-template-columns: 1fr auto;
    gap: 0.6rem;
  }
  .yd-masthead__kicker { display: none; }
  .yd-brand { justify-self: start; }
  .yd-masthead__side { justify-self: end; }
  .yd-nav-toggle { display: inline-flex; }

  .yd-meta {
    gap: 0.15rem 1rem;
    font-size: 0.66rem;
    letter-spacing: 0.12em;
  }

  .yd-nav {
    display: none;
    margin-top: 0.7rem;
    max-height: calc(100dvh - 13rem);
    overflow-y: auto;
  }
  .yd-header[data-open] .yd-nav { display: block; }
  .yd-nav__list {
    flex-direction: column;
    gap: 0;
    border-top: 1px solid var(--line-cream);
  }
  .yd-nav__item { border-bottom: 1px solid var(--line-cream); }
  .yd-nav__link {
    padding: 0.9rem 0.35rem;
    font-size: 1rem;
    border-bottom: 0;
  }
  .yd-nav__link[aria-current="page"] { padding-inline: 0.7rem; }

  .yd-col-4,
  .yd-col-5,
  .yd-col-6,
  .yd-col-7,
  .yd-col-8 { grid-column: 1 / -1; }

  .yd-track__row {
    grid-template-columns: 4.2rem minmax(0, 1fr);
    row-gap: 0.4rem;
  }
  .yd-track__meta { grid-column: 2; white-space: normal; }
}

@media (max-width: 640px) {
  .yd-utility-link:not(.yd-utility-link--accent) { display: none; }
  .yd-brand__mark { height: 1.4rem; }
  .yd-brand__sub { letter-spacing: 0.18em; }
  .yd-footer__grid { grid-template-columns: 1fr; }
  .yd-footer__base { justify-content: flex-start; }
  .yd-media,
  .yd-card { box-shadow: 6px 6px 0 var(--ink-black); }
  .yd-track__row { grid-template-columns: 3.6rem minmax(0, 1fr); }
}

/* ---------- 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;
  }
  .yd-reveal { opacity: 1; transform: none; }
  .yd-btn:hover,
  .yd-btn:focus-visible,
  .yd-chip:hover,
  .yd-chip:focus-visible { transform: none; }
  .yd-progress__bar { box-shadow: none; }
}