/* ==========================================================================
   足彩网竞彩 · 共享样式 /assets/site.css
   双层吸顶页头 + 四列页脚 + 通用组件
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  /* 色彩 */
  --c-green: #0FA36B;
  --c-green-deep: #0A6B47;
  --c-orange: #FF7A21;
  --c-action: #E8410C;
  --c-action-dark: #C93707;
  --c-navy: #0B1A33;
  --c-navy-2: #122A4D;
  --c-cyan: #17C3B2;
  --c-mist: #E8EDF3;
  --c-paper: #FBFCFE;
  --c-ink: #101826;
  --c-warn: #F5C518;

  --line: rgba(16, 24, 38, 0.14);
  --line-soft: rgba(16, 24, 38, 0.08);
  --line-light: rgba(255, 255, 255, 0.16);
  --text-soft: rgba(16, 24, 38, 0.68);
  --text-on-dark: rgba(255, 255, 255, 0.78);
  --text-on-dark-soft: rgba(255, 255, 255, 0.58);

  /* 字号阶梯 12 / 14 / 17 / 22 / 30 / 44 / 64 */
  --fs-tag: 12px;
  --fs-s: 14px;
  --fs-body: 17px;
  --fs-m: 22px;
  --fs-l: 30px;
  --fs-xl: 44px;
  --fs-2xl: 64px;

  /* 尺度 */
  --wrap: 1240px;
  --gut: 24px;
  --header-h: 56px;
  --nav-h: 48px;
  --band-h: 88px;
  --radius: 2px;

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

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

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

body {
  margin: 0;
  background: var(--c-paper);
  color: var(--c-ink);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.75;
  font-weight: 400;
  overflow-wrap: break-word;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.05;
}

p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
dl, dd { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
img, svg { max-width: 100%; }
img { display: block; height: auto; }
table { border-collapse: collapse; }
hr { border: 0; border-top: 1px solid var(--line); margin: 0; }

::selection { background: var(--c-green); color: #fff; }

/* 焦点环：全站统一 2px */
:focus-visible {
  outline: 2px solid var(--c-orange);
  outline-offset: 3px;
}

/* ---------- 3. 中文排版基础 ---------- */
.is-mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

.prose {
  max-width: 38em;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: rgba(16, 24, 38, 0.86);
  border-left: 2px solid var(--c-green);
  padding-left: 22px;
}

.prose p + p { margin-top: 1.05em; }
.prose h2 { font-size: var(--fs-l); margin: 1.7em 0 0.6em; }
.prose h3 { font-size: var(--fs-m); margin: 1.5em 0 0.5em; }
.prose ul, .prose ol { margin: 1.05em 0; padding-left: 1.2em; list-style: disc; }
.prose li + li { margin-top: 0.45em; }
.prose a { color: var(--c-green-deep); text-decoration: underline; text-underline-offset: 3px; }
.prose strong { font-weight: 700; }

/* ---------- 4. 布局容器与网格 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gut);
}

.grid { display: grid; gap: var(--gut); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--split { grid-template-columns: 7fr 5fr; }

.section { padding: 72px 0; }
.section--tight { padding: 48px 0; }
.section--mist { background: var(--c-mist); }
.section--navy { background: var(--c-navy); color: #fff; }
.section--navy .prose { color: rgba(255, 255, 255, 0.82); }

/* ---------- 5. 章节色带 ---------- */
.band {
  background: var(--c-navy);
  color: #fff;
  border-top: 1px solid var(--line-light);
  border-bottom: 1px solid var(--line-light);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.04) 0 1px,
    transparent 1px 24px
  );
}

.band--light {
  background-color: var(--c-mist);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(16, 24, 38, 0.05) 0 1px,
    transparent 1px 24px
  );
  color: var(--c-ink);
  border-color: var(--line);
}

.band__inner {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: var(--band-h);
  padding: 14px 0;
  flex-wrap: wrap;
}

.band__num {
  font-family: var(--font-mono);
  font-size: var(--fs-l);
  font-weight: 700;
  line-height: 1;
  color: var(--c-orange);
  font-variant-numeric: tabular-nums;
}

.band__title {
  font-size: var(--fs-l);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0;
}

.band__note {
  margin-left: auto;
  font-size: var(--fs-tag);
  letter-spacing: 0.12em;
  color: var(--text-on-dark-soft);
}

.band--light .band__note { color: var(--text-soft); }

/* ---------- 6. 卡片与展陈标签 ---------- */
.card {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 22px 22px;
}

.card__title {
  font-size: var(--fs-m);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 10px;
}

.card__body {
  font-size: var(--fs-s);
  line-height: 1.8;
  color: var(--text-soft);
  margin: 0;
}

.exhibit-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: var(--fs-tag);
  line-height: 1.6;
  letter-spacing: 0.12em;
  color: var(--text-soft);
  font-family: var(--font-sans);
}

.exhibit-tag--green { border-color: var(--c-green); color: var(--c-green-deep); }
.exhibit-tag--orange { border-color: var(--c-orange); color: #A8460D; }

/* ---------- 7. 图片容器 ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  background: var(--c-mist);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 4 / 5; }

.media__caption {
  display: block;
  padding-top: 8px;
  font-size: var(--fs-tag);
  letter-spacing: 0.12em;
  color: var(--text-soft);
}

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: var(--fs-s);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
  text-align: center;
  transition: background-color 0.18s ease-out, color 0.18s ease-out, border-color 0.18s ease-out;
}

.btn--primary { background: var(--c-action); color: #fff; }
.btn--primary:hover { background: var(--c-action-dark); }

.btn--green { background: var(--c-green); color: #fff; }
.btn--green:hover { background: var(--c-green-deep); }

.btn--ghost { background: transparent; border-color: var(--line); color: var(--c-ink); }
.btn--ghost:hover { border-color: var(--c-ink); }

.btn--onDark { background: transparent; border-color: var(--line-light); color: #fff; }
.btn--onDark:hover { background: rgba(255, 255, 255, 0.1); }

.btn--sm { min-height: 36px; padding: 0 14px; font-size: var(--fs-tag); letter-spacing: 0.06em; }

/* ---------- 9. 面包屑 ---------- */
.breadcrumb { padding-top: 20px; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-tag);
  letter-spacing: 0.08em;
  color: var(--text-soft);
}

.breadcrumb__item { display: inline-flex; align-items: center; }

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(16, 24, 38, 0.3);
}

.breadcrumb__link:hover { color: var(--c-green-deep); }
.breadcrumb__current { color: var(--c-ink); font-weight: 700; }

/* ---------- 10. 跳至主内容 ---------- */
.skip-link {
  position: fixed;
  left: 16px;
  top: -120px;
  z-index: 300;
  padding: 12px 20px;
  background: var(--c-orange);
  color: #fff;
  font-size: var(--fs-s);
  font-weight: 700;
  border-radius: var(--radius);
  transition: top 0.18s ease-out;
}

.skip-link:focus { top: 16px; }

/* ---------- 11. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--c-navy);
  color: #fff;
}

/* 上层品牌行 */
.brand-bar {
  background: var(--c-navy);
  border-bottom: 1px solid var(--line-light);
}

.brand-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: var(--header-h);
}

.brand-mark {
  display: flex;
  align-items: baseline;
  gap: 14px;
  min-width: 0;
}

.brand-mark__name {
  font-size: var(--fs-m);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1;
  color: #fff;
  white-space: nowrap;
}

.brand-mark__name::after {
  content: "";
  display: inline-block;
  width: 18px;
  height: 4px;
  margin-left: 10px;
  background: var(--c-orange);
  vertical-align: 0.18em;
}

.brand-mark__tag {
  font-size: var(--fs-tag);
  letter-spacing: 0.12em;
  color: var(--text-on-dark-soft);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.brand-bar__side {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-shrink: 0;
}

.brand-bar__meta {
  font-size: var(--fs-tag);
  letter-spacing: 0.12em;
  color: var(--text-on-dark-soft);
}

.login-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 0 16px;
  background: var(--c-action);
  color: #fff;
  border-radius: var(--radius);
  font-size: var(--fs-s);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
  transition: background-color 0.18s ease-out;
}

.login-link:hover { background: var(--c-action-dark); }

/* 下层栏目行 */
.nav-bar {
  background-color: var(--c-navy-2);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.045) 0 1px,
    transparent 1px 24px
  );
  border-bottom: 1px solid var(--line-light);
}

.nav-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: var(--nav-h);
}

.main-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex: 1 1 auto;
  min-width: 0;
}

.main-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-wrap: wrap;
}

.main-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  font-size: var(--fs-s);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--text-on-dark);
  transition: color 0.18s ease-out, background-color 0.18s ease-out;
}

.main-nav__link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
}

.main-nav__link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 2px;
  height: 3px;
  background: var(--c-green);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.24s ease-out;
}

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

.nav-utility {
  display: flex;
  align-items: center;
  padding-left: 20px;
  border-left: 1px solid var(--line-light);
  flex-shrink: 0;
}

.nav-utility__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  font-size: var(--fs-tag);
  letter-spacing: 0.12em;
  color: var(--text-on-dark-soft);
  transition: color 0.18s ease-out;
}

.nav-utility__link:hover { color: var(--c-orange); }

/* 移动端汉堡按钮（桌面隐藏） */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 0 12px;
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  font-size: var(--fs-tag);
  letter-spacing: 0.12em;
  transition: background-color 0.18s ease-out;
}

.nav-toggle:hover { background: rgba(255, 255, 255, 0.14); }

.nav-toggle__icon {
  position: relative;
  display: block;
  width: 18px;
  height: 12px;
  flex-shrink: 0;
}

.nav-toggle__icon span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: currentColor;
  transition: transform 0.18s ease-out, opacity 0.18s ease-out;
}

.nav-toggle__icon span:nth-child(1) { top: 0; }
.nav-toggle__icon span:nth-child(2) { top: 5.25px; }
.nav-toggle__icon span:nth-child(3) { top: 10.5px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(1) {
  transform: translateY(5.25px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(3) {
  transform: translateY(-5.25px) rotate(-45deg);
}

.nav-toggle__text { line-height: 1; }

/* 滚动进度条 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: rgba(255, 255, 255, 0.1);
  pointer-events: none;
}

.scroll-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--c-green), var(--c-orange));
}

/* ---------- 12. 页脚 ---------- */
.site-footer {
  background: var(--c-paper);
  border-top: 1px solid var(--line);
  color: var(--c-ink);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.3fr;
  gap: 36px var(--gut);
  padding: 56px 0 44px;
}

.footer-col { min-width: 0; }

.footer-col__title {
  position: relative;
  margin: 0 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-size: var(--fs-tag);
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.4;
  color: var(--c-ink);
}

.footer-col__title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 34px;
  height: 2px;
  background: var(--c-green);
}

.footer-col--brand .footer-brand {
  position: relative;
  margin: 0 0 12px;
  padding-left: 16px;
  font-size: var(--fs-l);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.05;
}

.footer-col--brand .footer-brand::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.34em;
  width: 6px;
  height: 0.72em;
  background: var(--c-orange);
}

.footer-note {
  font-size: var(--fs-s);
  line-height: 1.8;
  color: var(--text-soft);
}

.footer-note + .footer-note { margin-top: 6px; }

.footer-note--mono {
  font-family: var(--font-mono);
  font-size: var(--fs-tag);
  letter-spacing: 0.06em;
  color: rgba(16, 24, 38, 0.52);
}

.footer-links { display: grid; gap: 2px; }

.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  font-size: var(--fs-s);
  color: rgba(16, 24, 38, 0.72);
  transition: color 0.18s ease-out;
}

.footer-links a:hover { color: var(--c-green-deep); }

.footer-contact { display: grid; gap: 2px; }

.footer-contact dt {
  font-size: var(--fs-tag);
  letter-spacing: 0.12em;
  color: rgba(16, 24, 38, 0.48);
  line-height: 1.8;
}

.footer-contact dd {
  font-size: var(--fs-s);
  line-height: 1.7;
  color: rgba(16, 24, 38, 0.82);
}

.footer-contact dd.is-mono { font-size: 14px; letter-spacing: 0.02em; }
.footer-contact dt + dd { margin-bottom: 12px; }

/* 法务条 */
.legal-bar {
  background: var(--c-navy);
  color: var(--text-on-dark-soft);
}

.legal-bar__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  min-height: 58px;
  padding-top: 10px;
  padding-bottom: 10px;
  font-size: var(--fs-tag);
  letter-spacing: 0.06em;
}

.legal-bar__copy { line-height: 1.7; }

.legal-bar__links {
  display: flex;
  align-items: center;
  gap: 12px;
  line-height: 1.7;
}

.legal-bar__links a {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  color: rgba(255, 255, 255, 0.72);
  transition: color 0.18s ease-out;
}

.legal-bar__links a:hover { color: #fff; text-decoration: underline; text-underline-offset: 3px; }

.legal-bar__sep { color: rgba(255, 255, 255, 0.24); }

/* ---------- 13. 显现协议 ---------- */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.42s ease-out, transform 0.42s ease-out;
}

.has-js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 980px) {
  .section { padding: 54px 0; }
  .section--tight { padding: 38px 0; }

  .brand-bar__meta { display: none; }
  .brand-mark__tag { max-width: 46vw; }

  /* 栏目行收为 0 高，导航面板挂到品牌行下沿 */
  .nav-bar {
    background: transparent;
    background-image: none;
    border-bottom: 0;
    height: 0;
    min-height: 0;
    overflow: visible;
  }

  .nav-bar__inner {
    height: 0;
    min-height: 0;
    padding: 0;
    display: block;
  }

  .nav-toggle {
    display: inline-flex;
    position: absolute;
    top: 6px;
    right: var(--gut);
    z-index: 2;
  }

  .main-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: var(--header-h);
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    background: var(--c-navy-2);
    border-top: 1px solid var(--line-light);
    border-bottom: 1px solid var(--line-light);
    padding: 8px 0 14px;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }

  .main-nav[data-open="true"] { display: flex; }

  .main-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
  }

  .main-nav__list li { width: 100%; }

  .main-nav__link {
    width: 100%;
    justify-content: flex-start;
    padding: 0 24px;
    min-height: 50px;
    font-size: var(--fs-body);
    color: rgba(255, 255, 255, 0.86);
  }

  .main-nav__link:hover { background: rgba(255, 255, 255, 0.08); }

  .main-nav__link::after {
    left: 24px;
    right: auto;
    width: 22px;
    height: 2px;
    bottom: 12px;
  }

  .main-nav__link[aria-current="page"] { background: rgba(15, 163, 107, 0.16); }

  .nav-utility {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
    margin-top: 10px;
    padding: 10px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line-light);
  }

  .nav-utility li { width: 100%; }

  .nav-utility__link {
    width: 100%;
    padding: 0 24px;
    min-height: 46px;
    font-size: var(--fs-s);
    letter-spacing: 0.06em;
  }
}

@media (max-width: 860px) {
  .grid--2,
  .grid--3,
  .grid--split { grid-template-columns: minmax(0, 1fr); }

  .band__inner {
    min-height: 72px;
    gap: 14px;
  }

  .band__note { margin-left: 0; width: 100%; }

  .grid { gap: 18px; }
}

@media (max-width: 640px) {
  :root { --gut: 18px; }

  .brand-mark__tag { display: none; }
  .brand-mark__name { font-size: var(--fs-body); }

  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 30px; padding: 40px 0 30px; }

  .legal-bar__inner { flex-direction: column; align-items: flex-start; gap: 6px; }

  .prose { padding-left: 16px; }

  .section { padding: 44px 0; }
}

/* ---------- 15. 降低动态 ---------- */
@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;
  }

  .has-js [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .main-nav__link::after { transition: none; }
  .scroll-progress__bar { transition: none; }
}