/* ============================================================
   WILLIAMHILL 品牌专区 V2.0 — 共享站点样式 /assets/site.css
   设计语言：档案室秩序 · 精密网格 · 锐利直角 · 深绿 × 琥珀金
   ============================================================ */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; }
ul[class], ol[class], nav ul { list-style: none; }
img, svg, video { max-width: 100%; display: block; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
h1, h2, h3, h4 { font-weight: 900; }

/* ---------- 2. 变量 ---------- */
:root {
  /* 色彩 */
  --ink: #0B1F17;
  --deep: #14432F;
  --mid: #2E6B52;
  --amber: #D9A128;
  --gold: #F2CE6B;
  --coral: #FF5A36;
  --gray: #8C9793;
  --paper: #F6F4EE;
  --warm: #FFFCF6;
  --teal: #4A6B60;

  --line: rgba(140, 151, 147, .38);
  --line-strong: rgba(11, 31, 23, .16);
  --line-light: rgba(242, 206, 107, .26);

  /* 字体 */
  --font-head: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Source Han Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  /* 字号阶梯 */
  --fs-display: clamp(2.5rem, 7vw, 4.5rem);
  --fs-h1: clamp(2rem, 4.4vw, 3rem);
  --fs-h2: clamp(1.5rem, 2.6vw, 2rem);
  --fs-h3: clamp(1.125rem, 1.6vw, 1.5rem);
  --fs-body: clamp(1rem, .35vw + .94rem, 1.125rem);
  --fs-small: .875rem;
  --fs-mono: .6875rem;

  /* 空间（4px 基线） */
  --s1: 4px;  --s2: 8px;  --s3: 12px; --s4: 16px;
  --s5: 24px; --s6: 32px; --s7: 48px; --s8: 64px; --s9: 96px;

  --container: 1320px;
  --gutter: clamp(16px, 4vw, 40px);
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--paper);
  background-image: repeating-linear-gradient(90deg, rgba(11, 31, 23, .04) 0 1px, transparent 1px 120px);
  background-attachment: fixed;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.9;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

.display-title, .section-title, .card__title {
  font-family: var(--font-head);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.08;
  color: var(--ink);
}
.display-title { font-size: var(--fs-display); }
.section-title { font-size: var(--fs-h2); line-height: 1.2; }
.card__title { font-size: var(--fs-h3); line-height: 1.35; }

.lede {
  font-size: clamp(1.0625rem, 1vw + .8rem, 1.25rem);
  line-height: 1.85;
  color: var(--teal);
  max-width: 34em;
}

.prose { max-width: 38em; }
.prose p { margin-bottom: 1.15em; }
.prose p:last-child { margin-bottom: 0; }
.prose h2, .prose h3 { margin: 1.6em 0 .6em; color: var(--ink); }
.prose h2 { font-size: var(--fs-h2); }
.prose h3 { font-size: var(--fs-h3); }
.prose ul, .prose ol { padding-left: 1.4em; margin-bottom: 1.15em; }
.prose ul { list-style: square; }
.prose li { margin-bottom: .5em; }
.prose a { color: var(--deep); border-bottom: 1px solid var(--amber); }
.prose a:hover { background: rgba(217, 161, 40, .16); }
.prose strong { font-weight: 700; }
.prose code {
  font-family: var(--font-mono);
  font-size: .9em;
  background: rgba(74, 107, 96, .1);
  padding: .1em .4em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--s2);
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: .2em;
  color: var(--teal);
  margin-bottom: var(--s4);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: linear-gradient(90deg, var(--amber), var(--gold));
}

.rule { height: 1px; background: var(--line-strong); border: 0; position: relative; }
.rule--amber::after {
  content: "";
  position: absolute;
  left: 0; top: 0;
  width: 72px; height: 1px;
  background: linear-gradient(90deg, var(--amber), var(--gold));
}

/* ---------- 4. 布局原语 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--wide { max-width: 1560px; }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--s5);
}
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-12 { grid-column: span 12; }

.section { position: relative; padding-block: clamp(48px, 7vw, 96px); }
.section--tight { padding-block: clamp(32px, 4vw, 56px); }
.section--deep { background: var(--deep); color: var(--paper); }
.section--paper { background: var(--paper); }
.section--warm { background: var(--warm); }
.section--deep .display-title,
.section--deep .section-title,
.section--deep .card__title { color: var(--paper); }
.section--deep .lede { color: rgba(246, 244, 238, .78); }

/* ---------- 5. 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .6em;
  min-height: 44px;
  padding: .8em 1.5em;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-head);
  font-size: .9375rem;
  font-weight: 700;
  letter-spacing: .02em;
  line-height: 1.2;
  text-align: center;
  cursor: pointer;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease, transform .2s ease;
}
.btn--primary {
  background-image: linear-gradient(135deg, var(--amber), var(--gold));
  color: var(--ink);
  border-color: var(--amber);
}
.btn--primary:hover { background-image: linear-gradient(135deg, var(--gold), var(--amber)); transform: translateY(-1px); }
.btn--ghost { color: var(--deep); border-color: var(--line-strong); background: transparent; }
.btn--ghost:hover { border-color: var(--amber); color: var(--ink); }
.btn--light { color: var(--paper); border-color: rgba(246, 244, 238, .5); }
.btn--light:hover { border-color: var(--gold); color: var(--gold); }
.btn--coral { background-color: var(--coral); color: #fff; border-color: var(--coral); }
.btn--coral:hover { filter: brightness(1.08); transform: translateY(-1px); }

.card {
  display: flex;
  flex-direction: column;
  gap: var(--s3);
  padding: clamp(20px, 2.4vw, 32px);
  background: var(--warm);
  border: 1px solid var(--line-strong);
  border-radius: 0;
  transition: border-color .2s ease, transform .2s ease;
}
.card:hover { border-color: var(--amber); transform: translateY(-2px); }
.card__meta {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: .14em;
  color: var(--gray);
}

.metric {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--deep);
  font-variant-numeric: tabular-nums;
}
.metric__unit { font-size: .5em; color: var(--gray); margin-left: .35em; letter-spacing: .08em; }
.section--deep .metric { color: var(--gold); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid var(--line-strong);
  background: rgba(74, 107, 96, .07);
  color: var(--teal);
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: .12em;
  line-height: 1.8;
}
.tag--amber { border-color: rgba(217, 161, 40, .5); background: rgba(217, 161, 40, .12); color: #7E5A0C; }

.catalog { counter-reset: cat; border-top: 1px solid var(--line-strong); }
.catalog > li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--s4);
  align-items: baseline;
  padding: var(--s4) 0;
  border-bottom: 1px solid var(--line-strong);
}
.catalog > li::before {
  counter-increment: cat;
  content: "0" counter(cat);
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--amber);
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .06em;
  color: var(--gray);
}
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: .35em; list-style: none; }
.breadcrumb li { display: inline-flex; align-items: center; gap: .35em; }
.breadcrumb li + li::before { content: "/"; color: var(--line); }
.breadcrumb a { color: var(--teal); border-bottom: 1px solid transparent; }
.breadcrumb a:hover { border-bottom-color: var(--amber); color: var(--ink); }

/* ---------- 6. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background-color: #EDEFE9;
  background-image:
    linear-gradient(135deg, rgba(20, 67, 47, .10), rgba(140, 151, 147, .16)),
    repeating-linear-gradient(90deg, rgba(11, 31, 23, .06) 0 1px, transparent 1px 32px),
    repeating-linear-gradient(0deg, rgba(11, 31, 23, .06) 0 1px, transparent 1px 32px);
}
.media-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame__ph {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  padding: var(--s4);
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: .16em;
  color: var(--teal);
}
.media-frame__tag {
  position: absolute;
  left: 0; top: 0;
  padding: 5px 10px;
  background: var(--deep);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: .14em;
}
.media-frame__caption {
  margin-top: var(--s2);
  font-size: var(--fs-small);
  color: var(--gray);
  line-height: 1.7;
}

/* ---------- 7. 页头 ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: 100;
  transform: translate(-50%, -130%);
  padding: 10px 20px;
  background: var(--gold);
  color: var(--ink);
  font-weight: 700;
  font-size: var(--fs-small);
  transition: transform .18s ease;
}
.skip-link:focus { transform: translate(-50%, 0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--deep);
  color: var(--warm);
  border-bottom: 1px solid var(--line-light);
}
.site-header[data-condensed] { box-shadow: 0 8px 24px rgba(11, 31, 23, .22); }

/* 时间戳条 */
.header-topline {
  background: var(--ink);
  border-bottom: 1px solid rgba(242, 206, 107, .16);
  max-height: 40px;
  overflow: hidden;
  transition: max-height .25s ease;
}
.site-header[data-condensed] .header-topline { max-height: 0; }
.topline-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--s3);
  min-height: 36px;
  font-size: .75rem;
  color: rgba(246, 244, 238, .72);
}
.topline-meta { display: inline-flex; align-items: center; gap: 6px; letter-spacing: .04em; }
.topline-meta .mono { color: var(--gold); }
.topline-sep { color: rgba(242, 206, 107, .55); }

/* 品牌 × 检索 × 工具 */
.masthead { background: var(--deep); }
.masthead-inner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  grid-template-areas: "brand search utility";
  align-items: center;
  gap: var(--s7);
  padding-block: clamp(14px, 1.6vw, 22px);
  transition: padding .2s ease;
}
.site-header[data-condensed] .masthead-inner { padding-block: 10px; }

.brand { grid-area: brand; display: inline-flex; flex-direction: column; gap: 4px; color: var(--warm); }
.brand-mark {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.15rem, 1.6vw, 1.6rem);
  letter-spacing: -.02em;
  line-height: 1;
  transition: font-size .2s ease;
}
.brand-mark::before {
  content: "";
  width: .5em;
  height: .5em;
  margin-right: .42em;
  background-image: linear-gradient(135deg, var(--amber), var(--gold));
}
.site-header[data-condensed] .brand-mark { font-size: clamp(1rem, 1.3vw, 1.25rem); }
.brand-sub {
  font-size: var(--fs-mono);
  letter-spacing: .22em;
  color: rgba(242, 206, 107, .8);
}

.search-lane {
  grid-area: search;
  display: flex;
  align-items: center;
  gap: var(--s3);
  min-height: 44px;
  padding: 10px 14px;
  border: 1px solid rgba(242, 206, 107, .3);
  background: rgba(11, 31, 23, .42);
  color: rgba(255, 252, 246, .7);
  font-size: var(--fs-small);
  transition: border-color .2s ease, color .2s ease, background-color .2s ease;
}
.search-lane:hover,
.search-lane:focus-visible { border-color: var(--amber); color: var(--warm); background: rgba(11, 31, 23, .7); }
.search-lane__label {
  flex: 0 0 auto;
  font-size: var(--fs-mono);
  letter-spacing: .2em;
  color: var(--gold);
  padding-right: var(--s3);
  border-right: 1px solid rgba(242, 206, 107, .25);
}
.search-lane__hint {
  flex: 1 1 auto;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  letter-spacing: .04em;
}
.search-lane__go { flex: 0 0 auto; color: var(--gold); transition: transform .2s ease; }
.search-lane:hover .search-lane__go { transform: translateX(4px); }

.utility-nav {
  grid-area: utility;
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.4vw, 22px);
  font-size: var(--fs-small);
}
.utility-nav a {
  color: rgba(255, 252, 246, .72);
  padding-block: 6px;
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}
.utility-nav a:hover { color: var(--warm); border-bottom-color: var(--amber); }
.utility-link--coral {
  background: var(--coral);
  color: #fff !important;
  font-weight: 700;
  padding: 9px 16px !important;
  border-bottom: 0 !important;
  transition: filter .18s ease;
}
.utility-link--coral:hover { filter: brightness(1.1); }

/* 栏目导轨 */
.nav-rail {
  position: relative;
  background: rgba(11, 31, 23, .38);
  border-top: 1px solid var(--line-light);
}
.nav-rail-inner {
  display: flex;
  align-items: center;
  gap: var(--s4);
  min-height: 54px;
}
.nav-index-label {
  flex: 0 0 auto;
  padding-right: var(--s5);
  border-right: 1px solid rgba(242, 206, 107, .22);
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: .2em;
  color: rgba(246, 244, 238, .5);
  align-self: stretch;
  display: flex;
  align-items: center;
}
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  min-height: 42px;
  padding: 9px 14px;
  border: 1px solid rgba(242, 206, 107, .35);
  color: var(--warm);
  font-size: var(--fs-small);
  letter-spacing: .08em;
}
.nav-toggle__bars { position: relative; display: block; width: 18px; height: 12px; }
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--gold);
  transition: transform .2s ease;
}
.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

.primary-nav { margin-left: auto; }
.primary-nav__list { display: flex; align-items: stretch; }
.primary-nav__list li { counter-increment: navidx; display: flex; }
.primary-nav__list a {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: .55em;
  padding: 16px clamp(10px, 1.3vw, 20px);
  color: rgba(255, 252, 246, .82);
  font-family: var(--font-head);
  font-size: .9375rem;
  font-weight: 700;
  letter-spacing: .01em;
  transition: color .18s ease, background-color .18s ease;
}
.primary-nav__list a::before {
  content: "0" counter(navidx);
  font-family: var(--font-mono);
  font-size: .625rem;
  font-weight: 400;
  letter-spacing: .06em;
  color: var(--gray);
}
.primary-nav__list a:hover { color: var(--warm); background: rgba(46, 107, 82, .55); }
.primary-nav__list a[aria-current="page"] {
  background-image: linear-gradient(135deg, var(--amber), var(--gold));
  color: var(--ink);
}
.primary-nav__list a[aria-current="page"]::before { color: rgba(11, 31, 23, .62); }

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background-image: linear-gradient(90deg, var(--amber), var(--gold));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform .12s linear;
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 104px);
  background: var(--deep);
  color: var(--paper);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 1px;
  background-image: linear-gradient(90deg, var(--amber), rgba(217, 161, 40, 0) 65%);
}

.footer-skyline {
  height: clamp(58px, 8vw, 104px);
  background-repeat: no-repeat;
  background-color: transparent;
  background-image:
    linear-gradient(rgba(140, 151, 147, .30), rgba(140, 151, 147, .30)),
    linear-gradient(rgba(140, 151, 147, .22), rgba(140, 151, 147, .22)),
    linear-gradient(rgba(140, 151, 147, .26), rgba(140, 151, 147, .26)),
    linear-gradient(rgba(140, 151, 147, .18), rgba(140, 151, 147, .18)),
    linear-gradient(rgba(140, 151, 147, .24), rgba(140, 151, 147, .24)),
    linear-gradient(rgba(140, 151, 147, .34), rgba(140, 151, 147, .34)),
    linear-gradient(rgba(140, 151, 147, .20), rgba(140, 151, 147, .20)),
    linear-gradient(rgba(140, 151, 147, .28), rgba(140, 151, 147, .28)),
    linear-gradient(rgba(140, 151, 147, .16), rgba(140, 151, 147, .16)),
    linear-gradient(rgba(140, 151, 147, .30), rgba(140, 151, 147, .30)),
    linear-gradient(rgba(140, 151, 147, .20), rgba(140, 151, 147, .20)),
    linear-gradient(rgba(140, 151, 147, .26), rgba(140, 151, 147, .26)),
    linear-gradient(rgba(140, 151, 147, .34), rgba(140, 151, 147, .34)),
    linear-gradient(rgba(140, 151, 147, .22), rgba(140, 151, 147, .22));
  background-position:
    2% bottom, 7% bottom, 12% bottom, 19% bottom, 24% bottom, 33% bottom, 39% bottom,
    46% bottom, 55% bottom, 62% bottom, 71% bottom, 78% bottom, 88% bottom, 95% bottom;
  background-size:
    14px 34%, 9px 58%, 22px 44%, 12px 72%, 30px 52%, 10px 88%, 18px 63%,
    26px 40%, 12px 76%, 20px 50%, 14px 66%, 28px 36%, 10px 82%, 16px 55%;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) minmax(0, 1.7fr);
  gap: clamp(32px, 5vw, 80px);
  padding-block: clamp(40px, 5vw, 64px) clamp(28px, 3vw, 40px);
}
.footer-mark {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  letter-spacing: -.02em;
  line-height: 1;
  color: var(--warm);
}
.footer-sub {
  margin-top: 8px;
  font-size: .75rem;
  letter-spacing: .22em;
  color: var(--gold);
}
.footer-tagline {
  margin: var(--s4) 0 var(--s5);
  max-width: 26em;
  font-size: .9375rem;
  line-height: 1.85;
  color: rgba(246, 244, 238, .72);
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--s5);
}
.footer-col-title {
  margin-bottom: var(--s4);
  padding-bottom: var(--s2);
  border-bottom: 1px solid var(--line-light);
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  font-weight: 400;
  letter-spacing: .2em;
  color: var(--gold);
}
.footer-links { display: grid; gap: 10px; }
.footer-links a {
  display: inline-block;
  padding-block: 2px;
  font-size: .9375rem;
  color: rgba(246, 244, 238, .78);
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease, transform .18s ease;
}
.footer-links a:hover { color: var(--warm); border-bottom-color: var(--amber); transform: translateX(3px); }

.footer-contact {
  display: grid;
  gap: 6px;
  padding-block: var(--s5);
  border-top: 1px solid var(--line-light);
  border-bottom: 1px solid var(--line-light);
  font-size: .875rem;
  color: rgba(246, 244, 238, .8);
}
.footer-contact-line { display: flex; flex-wrap: wrap; gap: .5em; }
.footer-contact-line .mono { color: var(--gold); }

.footer-note {
  margin-top: var(--s5);
  max-width: 62em;
  font-size: .8125rem;
  line-height: 1.85;
  color: rgba(246, 244, 238, .58);
}
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--s4);
  padding-block: var(--s5) var(--s6);
  font-size: .75rem;
  color: rgba(246, 244, 238, .55);
}
.footer-icp { font-family: var(--font-mono); letter-spacing: .1em; color: rgba(242, 206, 107, .72); }

/* 右下角常驻反馈锚点 */
.feedback-anchor {
  position: fixed;
  right: clamp(14px, 2.5vw, 28px);
  bottom: clamp(14px, 2.5vw, 28px);
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  background: var(--coral);
  color: #fff;
  font-family: var(--font-head);
  font-size: .875rem;
  font-weight: 700;
  letter-spacing: .04em;
  box-shadow: 0 8px 22px rgba(255, 90, 54, .3);
  transition: transform .2s ease, filter .2s ease;
}
.feedback-anchor:hover { transform: translateY(-2px); filter: brightness(1.06); }
.feedback-anchor__dot { display: block; width: 8px; height: 8px; background: #fff; }

/* ---------- 9. 动效：滚动显现 ---------- */
.has-js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .55s ease, transform .55s cubic-bezier(.22, .61, .36, 1);
  will-change: opacity, transform;
}
.has-js .reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 10. 焦点可见 ---------- */
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; }
.site-header :focus-visible { outline-color: var(--gold); }
.site-footer :focus-visible { outline-color: var(--gold); }
.feedback-anchor:focus-visible { outline-color: var(--ink); }

/* ---------- 11. 响应式 ---------- */
@media (max-width: 1080px) {
  .masthead-inner {
    grid-template-columns: auto auto;
    grid-template-areas: "brand utility" "search search";
    row-gap: var(--s4);
    gap: var(--s4);
  }
  .search-lane { justify-self: stretch; }
  .footer-top { grid-template-columns: 1fr; }
  .grid-12 { gap: var(--s4); }
  .span-3, .span-4, .span-5 { grid-column: span 6; }
  .span-7, .span-8, .span-9 { grid-column: span 12; }
}

@media (max-width: 900px) {
  .nav-rail-inner { flex-wrap: wrap; }
  .nav-index-label { flex: 1 1 auto; border-right: 0; }
  .nav-toggle { display: inline-flex; margin-left: auto; }
  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    margin-left: 0;
    z-index: 5;
    background: #0F3324;
    border-top: 1px solid var(--line-light);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: max-height .3s ease, opacity .22s ease, visibility .22s ease;
  }
  .primary-nav[data-open] {
    max-height: 80vh;
    overflow-y: auto;
    opacity: 1;
    visibility: visible;
  }
  .primary-nav__list { flex-direction: column; padding: 6px 0; }
  .primary-nav__list a {
    width: 100%;
    padding: 14px var(--gutter);
    justify-content: flex-start;
    border-bottom: 1px solid rgba(242, 206, 107, .12);
  }
}

@media (max-width: 640px) {
  .masthead-inner {
    grid-template-columns: 1fr;
    grid-template-areas: "brand" "search" "utility";
    row-gap: var(--s4);
  }
  .utility-nav { justify-self: start; flex-wrap: wrap; gap: var(--s3); }
  .topline-inner { justify-content: flex-start; }
  .footer-cols { grid-template-columns: 1fr 1fr; gap: var(--s5) var(--s4); }
  .footer-legal { flex-direction: column; align-items: flex-start; }
  .feedback-anchor { padding: 10px 14px; font-size: .8125rem; }
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8, .span-9, .span-12 { grid-column: span 6; }
}

@media (max-width: 400px) {
  .footer-cols { grid-template-columns: 1fr; }
}

/* ---------- 12. 偏好减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .has-js .reveal { opacity: 1 !important; transform: none !important; }
  .scroll-progress { transition: none; }
  .feedback-anchor:hover, .card:hover, .btn:hover, .footer-links a:hover { transform: none; }
}