/* ===== 华体育看台 · 共享样式 /assets/site.css ===== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 24px);
}

body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body.nav-open { overflow: hidden; }

h1, h2, h3, h4, h5 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.02em;
  font-stretch: condensed;
}

h1 { font-size: clamp(36px, 5.2vw, 64px); }
h2 { font-size: clamp(28px, 3.4vw, 44px); }
h3 { font-size: clamp(20px, 2.2vw, 28px); }
h4 { font-size: 18px; }

p { margin: 0 0 1.2em; }
p:last-child { margin-bottom: 0; }

ul, ol { margin: 0; padding: 0; }

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

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

button { font: inherit; color: inherit; }

hr { border: 0; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.site-footer :focus-visible { outline-color: var(--amber); }

/* ===== 变量 ===== */
:root {
  --ink: #08231E;
  --ink-lift: #0F342C;
  --cyan: #2EF2C4;
  --cyan-soft: #8FFBE4;
  --amber: #E9A94B;
  --paper: #F3EFE3;
  --paper-dim: #DED6C4;
  --slate: #7C9A8F;
  --carbon: #101C18;
  --coral: #F06A4D;

  --line: rgba(243, 239, 227, 0.16);
  --line-cyan: rgba(46, 242, 196, 0.28);

  --font-display: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular", Consolas, "Courier New", monospace;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, serif;

  --header-h: 78px;
  --container: 1240px;
  --gap: 24px;

  --cut: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
}

/* ===== 无障碍 ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 999;
  padding: 10px 18px;
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  transform: translateY(-200%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
  outline-color: var(--paper);
}

/* ===== 容器与网格 ===== */
.shell {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 28px;
}

.grid {
  display: grid;
  gap: var(--gap);
}

.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.prose {
  max-width: 72ch;
  line-height: 1.78;
}

.divider {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 40px 0;
}

.guide-line {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, rgba(46, 242, 196, 0.55), rgba(46, 242, 196, 0));
  transform: rotate(-6deg);
  transform-origin: left center;
  opacity: 0.6;
}

/* ===== 文字元素 ===== */
.eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.section-num {
  display: block;
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(38px, 6vw, 64px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1px var(--amber);
  font-variant-numeric: tabular-nums;
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
}

.section-title {
  font-size: clamp(26px, 3vw, 40px);
}

.lede {
  max-width: 62ch;
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.8;
  color: var(--paper-dim);
}

.data-figure {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 24px;
  border: 1px solid var(--paper-dim);
  border-radius: 0;
  background: transparent;
  color: var(--paper);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease, transform 0.16s ease;
}

.btn:hover { border-color: var(--cyan); color: var(--cyan); }

.btn--cyan {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}
.btn--cyan:hover {
  background: var(--cyan-soft);
  border-color: var(--cyan-soft);
  color: var(--ink);
}

.btn--amber {
  border-color: var(--amber);
  color: var(--amber);
}
.btn--amber:hover {
  background: rgba(233, 169, 75, 0.14);
  border-color: var(--amber);
  color: var(--amber);
}

.btn--ghost {
  border-color: rgba(243, 239, 227, 0.34);
  color: var(--paper);
}

/* ===== 标签 ===== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid var(--paper-dim);
  background: var(--paper);
  color: var(--carbon);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.6;
  clip-path: polygon(6px 0, 100% 0, 100% 100%, 0 100%, 0 6px);
}

.tag--cyan {
  border-color: rgba(46, 242, 196, 0.5);
  background: rgba(46, 242, 196, 0.12);
  color: var(--cyan);
}

.tag--amber {
  border-color: rgba(233, 169, 75, 0.5);
  background: rgba(233, 169, 75, 0.12);
  color: var(--amber);
}

.tag[aria-pressed="true"],
.tag[data-active] {
  border-color: var(--cyan);
  background: rgba(46, 242, 196, 0.18);
  color: var(--cyan);
}

/* ===== 卡片 ===== */
.card {
  position: relative;
  padding: 24px;
  border: 1px solid var(--paper-dim);
  background: var(--paper);
  color: var(--carbon);
  box-shadow: 2px 2px 0 rgba(222, 214, 196, 0.55);
  transition: transform 0.16s ease, border-color 0.16s ease, box-shadow 0.16s ease;
}

.card--ink {
  background: var(--ink-lift);
  border-color: var(--line);
  color: var(--paper);
  box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.38);
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: 3px 4px 0 rgba(46, 242, 196, 0.22);
}

/* ===== 图片容器 ===== */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--ink-lift);
  border: 1px solid var(--line);
  aspect-ratio: 4 / 3;
}

.media-frame > img,
.media-frame > picture > img,
.media-frame > svg {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  box-shadow: inset 0 0 0 1px rgba(46, 242, 196, 0.16);
  background-image: repeating-linear-gradient(0deg, rgba(8, 35, 30, 0.16) 0 1px, transparent 1px 5px);
}

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 14px 16px;
  background: linear-gradient(180deg, rgba(8, 35, 30, 0), rgba(8, 35, 30, 0.92));
  color: var(--paper-dim);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  list-style: none;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin: 0 10px;
  color: rgba(124, 154, 143, 0.6);
}

.breadcrumb-item a {
  color: var(--paper-dim);
  transition: color 0.16s ease;
}
.breadcrumb-item a:hover { color: var(--cyan); }

.breadcrumb-item[aria-current="page"] { color: var(--cyan); }

/* ===== 目录高亮 ===== */
.toc-link {
  display: block;
  padding: 6px 0 6px 14px;
  border-left: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate);
  transition: color 0.16s ease, border-color 0.16s ease;
}

.toc-link:hover { color: var(--cyan-soft); }

.toc-link[data-active] {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

[data-toc] a[data-active] { color: var(--cyan); }

/* ===== 头部 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  width: 100%;
  background: linear-gradient(180deg, rgba(8, 35, 30, 0.94), rgba(8, 35, 30, 0.62));
  border-bottom: 1px solid transparent;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.site-header[data-scrolled] {
  background: var(--ink-lift);
  border-bottom-color: var(--line);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.34);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  width: 100%;
  max-width: var(--container);
  min-height: var(--header-h);
  margin-inline: auto;
  padding-inline: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  color: var(--paper);
}

.brand-mark {
  display: inline-flex;
  align-items: flex-end;
  gap: 3px;
  height: 26px;
}

.brand-bar {
  display: block;
  width: 4px;
  background: var(--cyan);
  transition: height 0.2s ease;
}
.brand-bar:nth-child(1) { height: 38%; }
.brand-bar:nth-child(2) { height: 68%; background: var(--cyan-soft); }
.brand-bar:nth-child(3) { height: 100%; background: var(--amber); }

.brand:hover .brand-bar:nth-child(1) { height: 58%; }
.brand:hover .brand-bar:nth-child(2) { height: 82%; }

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand-sub {
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.26em;
  color: var(--slate);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
}

.nav-item { position: relative; }

.nav-link {
  position: relative;
  display: inline-block;
  padding: 10px 12px;
  color: var(--paper);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: color 0.16s ease;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 3px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.nav-link:hover { color: var(--cyan-soft); }
.nav-link:hover::after { transform: scaleX(1); background: var(--cyan-soft); }

.nav-link[aria-current="page"] { color: var(--cyan); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: 14px;
  padding: 9px 18px;
  border: 1px solid var(--amber);
  background: rgba(233, 169, 75, 0.08);
  color: var(--amber);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  white-space: nowrap;
  clip-path: var(--cut);
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.nav-cta:hover {
  background: var(--amber);
  color: var(--ink);
  border-color: var(--amber);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 9px 14px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--paper);
  cursor: pointer;
  transition: border-color 0.16s ease, color 0.16s ease;
}

.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }

.nav-toggle-icon {
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
  width: 18px;
  height: 12px;
}

.nav-toggle-icon span {
  display: block;
  height: 1px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle-text {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.site-header[data-open] .nav-toggle { border-color: var(--cyan); color: var(--cyan); }
.site-header[data-open] .nav-toggle-icon span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.site-header[data-open] .nav-toggle-icon span:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle-icon span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

.site-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

/* ===== 页脚 ===== */
.site-footer {
  position: relative;
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  border-top: 1px solid var(--cyan);
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 3fr) minmax(0, 3fr);
  gap: 48px;
  width: 100%;
  max-width: 1320px;
  margin-inline: auto;
  padding: clamp(48px, 6vw, 80px) 28px 0;
}

.footer-contact {
  padding: 28px;
  border: 1px solid var(--amber);
  background:
    linear-gradient(155deg, rgba(233, 169, 75, 0.12), rgba(233, 169, 75, 0) 62%),
    var(--ink-lift);
  clip-path: var(--cut);
}

.footer-eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--amber);
}

.footer-cta {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
  border-bottom: 1px solid rgba(233, 169, 75, 0.5);
  padding-bottom: 6px;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.footer-cta:hover { color: var(--amber); border-bottom-color: var(--amber); }

.footer-cta-arrow {
  font-size: 0.8em;
  color: var(--amber);
  transition: transform 0.16s ease;
}

.footer-cta:hover .footer-cta-arrow { transform: translateX(4px); }

.footer-note {
  margin: 18px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate);
}

.contact-list {
  margin: 24px 0 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.contact-item {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding-top: 12px;
  border-top: 1px dashed rgba(243, 239, 227, 0.14);
}

.contact-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.contact-value {
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-all;
  font-variant-numeric: tabular-nums;
}

.copy-btn {
  padding: 5px 10px;
  border: 1px solid rgba(46, 242, 196, 0.45);
  background: transparent;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.copy-btn:hover { background: rgba(46, 242, 196, 0.14); }

.copy-btn[data-state="done"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.copy-btn[data-state="fail"] {
  border-color: var(--coral);
  color: var(--coral);
  background: rgba(240, 106, 77, 0.12);
}

.footer-col { padding-top: 8px; }

.footer-col-title {
  margin: 0 0 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-links {
  list-style: none;
  display: grid;
  gap: 12px;
}

.footer-link {
  position: relative;
  display: inline-block;
  padding-left: 14px;
  font-size: 15px;
  color: var(--paper-dim);
  transition: color 0.16s ease, padding-left 0.16s ease;
}

.footer-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background: var(--cyan);
  opacity: 0.6;
  transition: width 0.16s ease, opacity 0.16s ease;
}

.footer-link:hover { color: var(--cyan-soft); }
.footer-link:hover::before { width: 10px; opacity: 1; }

.footer-base {
  margin-top: 56px;
  border-top: 1px solid rgba(46, 242, 196, 0.24);
}

.footer-base-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 28px;
  width: 100%;
  max-width: 1320px;
  margin-inline: auto;
  padding: 20px 28px 36px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--slate);
  font-variant-numeric: tabular-nums;
}

.footer-base-brand { color: var(--paper-dim); }

.footer-icp { margin-left: auto; }

/* ===== 平板 ===== */
@media (max-width: 1080px) {
  .nav-link { padding: 10px 9px; font-size: 14px; }
  .nav-cta { margin-left: 8px; padding: 8px 14px; font-size: 13px; }
  .header-inner { gap: 18px; }
}

/* ===== 移动导航 ===== */
@media (max-width: 900px) {
  :root { --header-h: 64px; }

  .header-inner {
    padding-inline: 18px;
    gap: 14px;
  }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 190;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    padding: 20px 18px 48px;
    background: var(--ink);
    border-top: 1px solid var(--line);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease;
  }

  .site-header[data-open] .site-nav {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    counter-reset: navi;
    width: 100%;
  }

  .nav-item {
    counter-increment: navi;
    border-bottom: 1px solid rgba(243, 239, 227, 0.12);
  }

  .nav-link {
    display: flex;
    align-items: baseline;
    gap: 16px;
    width: 100%;
    padding: 18px 4px;
    font-family: var(--font-display);
    font-size: 21px;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--paper);
  }

  .nav-link::before {
    content: counter(navi, decimal-leading-zero);
    font-family: var(--font-mono);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--amber);
  }

  .nav-link::after { display: none; }

  .nav-link[aria-current="page"] { color: var(--cyan); }

  .nav-cta {
    justify-content: center;
    width: 100%;
    margin: 26px 0 0;
    padding: 15px 18px;
    font-size: 15px;
  }

  .footer-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 36px;
    padding-inline: 18px;
  }

  .footer-contact { padding: 22px; }

  .footer-base-inner { padding: 18px 18px 32px; }

  .footer-icp { margin-left: 0; }

  .shell { padding-inline: 18px; }

  .grid--12 { grid-template-columns: minmax(0, 1fr); }

  .footer-link { padding: 4px 0 4px 14px; }
}

@media (max-width: 560px) {
  body { font-size: 16px; }

  .brand-sub { display: none; }

  .contact-item {
    grid-template-columns: minmax(0, 1fr) auto;
    row-gap: 4px;
  }

  .contact-key { grid-column: 1 / -1; }

  .footer-base-inner { gap: 8px 20px; }

  .copy-btn { padding: 4px 8px; }
}

/* ===== 动效收敛 ===== */
@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;
  }

  .card:hover { transform: none; }
  .footer-cta:hover .footer-cta-arrow { transform: none; }
  .brand:hover .brand-bar { height: revert-layer; }
  .site-nav { transform: none; }
}

@media print {
  .site-header,
  .site-footer,
  .skip-link,
  .site-progress { display: none !important; }

  body { background: #fff; color: #101C18; }
  .card { box-shadow: none; }
}