/* ==========================================================
   新英体育场 · 共享外壳样式  /assets/site.css
   夜间数据台：墨绿底 / 面板分层 / 荧光青与赛道橙数据高亮
   ========================================================== */

:root {
  --ink: #071A16;
  --night: #0D1B2E;
  --panel: #12362E;
  --cyan: #3BF2C8;
  --orange: #FF6A3D;
  --cream: #F2EBDD;
  --black: #0A0F0D;
  --sage: #8FA89E;
  --line: #C9C3B6;
  --amber: #F5B841;

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

  --step-hero: clamp(44px, 7vw, 104px);
  --step-h2: clamp(28px, 3.4vw, 48px);
  --step-h3: clamp(20px, 2vw, 26px);
  --step-body: clamp(16px, 1.05vw, 18px);

  --hard-shadow: 6px 6px 0 rgba(0, 0, 0, .5);
  --ease: cubic-bezier(.2, .7, .2, 1);
  --dur: 200ms;

  --header-h: 78px;
  --shell: min(1180px, 100% - 48px);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--ink);
  background-image: radial-gradient(1100px 620px at 84% -12%, rgba(13, 27, 46, .95), transparent 68%);
  background-repeat: no-repeat;
  color: var(--cream);
  font-family: var(--font-sans);
  font-size: var(--step-body);
  font-weight: 400;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 { margin: 0; font-weight: 900; letter-spacing: -.02em; line-height: 1.2; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; }
img, picture, svg, video { max-width: 100%; }
img { display: block; }
button { font: inherit; color: inherit; }
table { border-collapse: collapse; }
main { display: block; }

a {
  color: var(--cyan);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

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

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 12px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--cyan);
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  text-decoration: none;
  border: 2px solid var(--ink);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, .6);
  transform: translateY(-180%);
  transition: transform var(--dur) var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ==========================================================
   页头：叠加式透明导航 -> 滚动后实体墨绿
   ========================================================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 90;
  background: linear-gradient(180deg, rgba(7, 26, 22, .96) 0%, rgba(7, 26, 22, .62) 58%, rgba(7, 26, 22, 0) 100%);
  border-bottom: 2px solid transparent;
  transition: background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}
.site-header.is-stuck {
  background: var(--ink);
  background-image: none;
  border-bottom-color: rgba(59, 242, 200, .45);
  box-shadow: 0 8px 0 rgba(4, 12, 10, .34);
}

.header-inner {
  width: var(--shell);
  margin-inline: auto;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 20px;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  text-decoration: none;
  color: var(--cream);
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  background: var(--panel);
  border: 2px solid var(--cyan);
  color: var(--cyan);
  font-size: 20px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0;
  box-shadow: 3px 3px 0 rgba(0, 0, 0, .55);
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}
.brand:hover .brand-mark,
.brand:focus-visible .brand-mark {
  background: var(--cyan);
  color: var(--ink);
  box-shadow: 5px 5px 0 var(--orange);
}
.brand-text { display: grid; gap: 1px; }
.brand-name {
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -.01em;
  line-height: 1.25;
  color: var(--cream);
}
.brand-line {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .1em;
  line-height: 1.4;
  color: var(--sage);
}

/* 版本徽章 */
.version-badge {
  flex: 0 0 auto;
  padding: 5px 11px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .04em;
  line-height: 1.5;
  color: var(--amber);
  background: rgba(245, 184, 65, .08);
  border: 1px solid rgba(245, 184, 65, .55);
  white-space: nowrap;
}

/* 导航 */
.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 24px;
}
.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
}
.nav-item { margin: 0; }
.nav-link {
  position: relative;
  display: inline-block;
  padding: 10px 11px;
  color: rgba(242, 235, 221, .8);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .05em;
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 3px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}
.nav-link:hover { color: var(--cream); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--cyan); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 2px solid var(--cyan);
  background: transparent;
  color: var(--cream);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .05em;
  line-height: 1.4;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}
.btn-primary {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
  box-shadow: 4px 4px 0 var(--orange);
}
.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--cream);
  border-color: var(--cyan);
  box-shadow: 7px 7px 0 var(--orange);
  transform: translate(-2px, -2px);
}
.btn-primary:active { transform: translate(0, 0); box-shadow: 2px 2px 0 var(--orange); }
.btn-ghost { border-color: rgba(242, 235, 221, .45); }
.btn-ghost:hover,
.btn-ghost:focus-visible { color: var(--cyan); border-color: var(--cyan); }

.nav-cta {
  flex: 0 0 auto;
  padding: 10px 16px;
  font-size: 13px;
}

/* 阅读进度条 */
.read-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 120ms linear;
  pointer-events: none;
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  place-items: center;
  margin-left: auto;
  width: 46px;
  height: 46px;
  padding: 0;
  background: rgba(18, 54, 46, .92);
  border: 2px solid rgba(59, 242, 200, .55);
  color: var(--cyan);
  cursor: pointer;
  transition: background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              color var(--dur) var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan); background: var(--panel); }
.nav-toggle-bars { display: grid; gap: 5px; width: 22px; }
.nav-toggle-bars span {
  display: block;
  height: 2px;
  width: 100%;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.nav-toggle[aria-expanded="true"] { background: var(--cyan); color: var(--ink); border-color: var(--cyan); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==========================================================
   页脚：记分牌式档案带
   ========================================================== */
.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  border-top: 2px solid var(--cyan);
  color: var(--cream);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, rgba(59, 242, 200, .055) 1px, transparent 1px),
    linear-gradient(0deg, rgba(59, 242, 200, .055) 1px, transparent 1px);
  background-size: 58px 58px;
  pointer-events: none;
}

.footer-inner {
  position: relative;
  width: var(--shell);
  margin-inline: auto;
  padding: 68px 0 52px;
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(0, .85fr) minmax(0, .95fr) minmax(0, 1.15fr);
  gap: 44px 40px;
  border-bottom: 1px solid rgba(201, 195, 182, .18);
}

.footer-brand { display: block; }
.footer-summary {
  margin-top: 18px;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(242, 235, 221, .72);
}
.footer-status {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-top: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--sage);
}
.status-dot {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(59, 242, 200, .18);
}

.footer-col { min-width: 0; }
.footer-col-title {
  margin: 0 0 18px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  line-height: 1.5;
  color: var(--cyan);
}
.footer-links {
  list-style: none;
  display: grid;
  gap: 11px;
}
.footer-link {
  display: inline-block;
  color: rgba(242, 235, 221, .78);
  font-size: 14px;
  line-height: 1.6;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.footer-link:hover,
.footer-link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.footer-contact { min-width: 0; }
.contact-list {
  list-style: none;
  display: grid;
  gap: 14px;
}
.contact-label {
  display: block;
  margin-bottom: 2px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .14em;
  line-height: 1.5;
  color: var(--amber);
}
.contact-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .01em;
  line-height: 1.65;
  color: rgba(242, 235, 221, .86);
  overflow-wrap: anywhere;
  word-break: break-word;
}

.footer-base {
  position: relative;
  width: var(--shell);
  margin-inline: auto;
  padding: 22px 0 34px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
  font-size: 12.5px;
  color: var(--sage);
}
.footer-legal {
  margin: 0;
  font-family: var(--font-mono);
  letter-spacing: .02em;
  line-height: 1.7;
}
.legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 22px;
  list-style: none;
}
.legal-links a {
  color: var(--sage);
  text-decoration: none;
  border-bottom: 1px solid rgba(143, 168, 158, .35);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.legal-links a:hover,
.legal-links a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ==========================================================
   页面可复用基础组件
   ========================================================== */
.shell {
  width: var(--shell);
  margin-inline: auto;
}

.section { padding-block: clamp(56px, 8vw, 112px); }
.section--night { background: var(--night); }
.section--panel { background: var(--panel); }
.section--cream { background: var(--cream); color: var(--black); }

.title-xl {
  font-size: var(--step-hero);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.06;
  margin: 0;
}
.title-lg {
  font-size: var(--step-h2);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.16;
  margin: 0;
}
.title-md {
  font-size: var(--step-h3);
  font-weight: 800;
  letter-spacing: -.01em;
  line-height: 1.35;
  margin: 0;
}
.lede {
  font-size: clamp(17px, 1.35vw, 20px);
  line-height: 1.85;
  color: rgba(242, 235, 221, .8);
}
.prose { max-width: 34em; }
.prose p { margin: 0 0 1.15em; }
.prose > :last-child { margin-bottom: 0; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .16em;
  line-height: 1.6;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  background: var(--orange);
}

.breadcrumbs {
  font-size: 13px;
  color: var(--sage);
}
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
}
.breadcrumbs li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.breadcrumbs li + li::before {
  content: "/";
  color: rgba(143, 168, 158, .6);
}
.breadcrumbs a {
  color: var(--sage);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.breadcrumbs a:hover,
.breadcrumbs a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}
.breadcrumbs [aria-current="page"] { color: var(--cream); }

/* 堆叠面板 */
.panel {
  position: relative;
  background: var(--panel);
  border: 2px solid rgba(201, 195, 182, .26);
  padding: clamp(22px, 3vw, 36px);
  transition: border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}
.panel:hover {
  border-color: var(--cyan);
  box-shadow: var(--hard-shadow);
  transform: translate(-2px, -2px);
}

/* 档案卡 */
.dossier {
  display: grid;
  gap: 12px;
  align-content: start;
  padding: 24px;
  background: var(--cream);
  color: var(--black);
  border: 2px solid var(--black);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, .5);
}

/* 标签 */
.tag {
  display: inline-block;
  padding: 3px 9px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  line-height: 1.7;
  color: var(--cyan);
  border: 1px solid currentColor;
}
.tag--orange { color: var(--orange); }
.tag--amber { color: var(--amber); }
.tag--ink {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* 横向数据带 */
.data-band {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(148px, 1fr);
  background: linear-gradient(135deg, rgba(13, 27, 46, .92), rgba(7, 26, 22, .92));
  border: 2px solid rgba(59, 242, 200, .35);
  overflow-x: auto;
}
.data-cell {
  padding: 18px 20px;
  border-right: 1px solid rgba(201, 195, 182, .16);
}
.data-cell:last-child { border-right: 0; }
.data-label {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: .08em;
  line-height: 1.5;
  color: var(--sage);
}
.data-figure {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 2.4vw, 32px);
  font-weight: 600;
  letter-spacing: -.01em;
  line-height: 1.2;
  color: var(--cyan);
}

/* 图片容器 */
.media-frame {
  position: relative;
  display: block;
  margin: 0;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: linear-gradient(140deg, var(--night), var(--panel) 55%, var(--ink));
  border: 2px solid rgba(201, 195, 182, .3);
}
.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(135deg, rgba(59, 242, 200, .07) 0 2px, transparent 2px 16px);
  pointer-events: none;
}
.media-frame > img,
.media-frame > picture,
.media-frame > svg {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-caption {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--sage);
}

.rule {
  height: 2px;
  border: 0;
  margin: 0;
  background: linear-gradient(90deg, var(--cyan), rgba(59, 242, 200, 0));
}

/* ==========================================================
   响应式
   ========================================================== */
@media (max-width: 1180px) {
  .version-badge { display: none; }
  .site-nav { gap: 14px; }
  .nav-link { padding: 10px 8px; font-size: 13px; }
  .nav-link::after { left: 8px; right: 8px; }
  .nav-cta { padding: 9px 13px; font-size: 12.5px; }
}

@media (max-width: 960px) {
  :root { --header-h: 66px; --shell: min(1180px, 100% - 36px); }

  .brand-mark { width: 34px; height: 34px; font-size: 17px; }
  .brand-name { font-size: 15.5px; }
  .brand-line { font-size: 10px; letter-spacing: .08em; }

  .nav-toggle { display: grid; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin-left: 0;
    padding: 16px 18px 24px;
    background: var(--panel);
    border-top: 2px solid var(--cyan);
    border-bottom: 2px solid var(--cyan);
    box-shadow: 0 14px 0 rgba(0, 0, 0, .42);
  }
  .site-nav[data-open] { display: flex; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .nav-item { border-bottom: 1px solid rgba(201, 195, 182, .16); }
  .nav-link {
    display: block;
    padding: 14px 10px;
    font-size: 16px;
    letter-spacing: .04em;
  }
  .nav-link::after { display: none; }
  .nav-link[aria-current="page"] {
    color: var(--ink);
    background: var(--cyan);
    padding-inline: 10px;
  }
  .nav-cta {
    width: 100%;
    margin-top: 6px;
    padding: 14px 16px;
    font-size: 14px;
  }

  .footer-inner {
    padding: 52px 0 40px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 36px 28px;
  }
  .footer-brand { grid-column: 1 / -1; }
  .footer-base {
    flex-direction: column;
    align-items: flex-start;
    padding-bottom: 28px;
  }
}

@media (max-width: 600px) {
  :root { --shell: min(1180px, 100% - 28px); }
  body { line-height: 1.78; }
  .header-inner { gap: 12px; }
  .brand-text { gap: 0; }
  .footer-inner { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .data-band { grid-auto-columns: minmax(132px, 1fr); }
  .data-cell { padding: 15px 16px; }
  .dossier { padding: 20px; box-shadow: 4px 4px 0 rgba(0, 0, 0, .5); }
}

/* ==========================================================
   动效降级
   ========================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .skip-link { transition: none; }
  .btn-primary:hover,
  .btn-primary:focus-visible,
  .panel:hover { transform: none; }
  .read-progress { transition: none; }
}