/* ============================================================
   必一体育中心 · 共享样式表 /assets/site.css
   深夜战术室 × 高原球场：墨绿为底，荧光青为线，红土为签
   ============================================================ */

/* ---------- 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; list-style: none; }

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

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

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

table { border-collapse: collapse; width: 100%; }

:target { scroll-margin-top: 150px; }

/* ---------- 2. Tokens ---------- */
:root {
  --ink: #0B1F1A;
  --ink-2: #102A22;
  --ink-3: #071410;

  --cyan: #35F2C0;
  --cyan-2: #1E8F76;

  --clay: #C1502E;
  --indigo: #4A3B7A;
  --wine: #6B2233;

  --mist: #C9D3CE;
  --mist-2: #8C9A94;
  --paper: #F4F7F5;
  --brass: #D9A441;
  --blue: #2F6FB0;

  --line: rgba(201, 211, 206, 0.18);
  --line-soft: rgba(201, 211, 206, 0.10);
  --line-cyan: rgba(53, 242, 192, 0.38);

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

  --shell: 1320px;
  --gutter: clamp(20px, 6vw, 88px);
  --gap: 24px;

  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --t-fast: 120ms var(--ease);
  --t-mid: 180ms var(--ease);
  --t-slow: 280ms var(--ease);
}

/* ---------- 3. Base typography ---------- */
body {
  background-color: var(--ink);
  color: var(--mist);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  font-weight: 400;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1 {
  font-size: clamp(2.8rem, 7vw, 7rem);
  font-weight: 200;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

h2 {
  font-size: clamp(1.75rem, 3.4vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--paper);
}

h3 {
  font-size: clamp(1.2rem, 1.8vw, 1.6rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--paper);
}

h4 {
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

strong { font-weight: 700; color: var(--paper); }

a { transition: color var(--t-mid), border-color var(--t-mid); }

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

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

/* ---------- 4. Layout primitives ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

.prose { max-width: 38em; }
.prose > * + * { margin-top: 1em; }
.prose h2 { margin-top: 1.8em; }
.prose h3 { margin-top: 1.5em; }
.prose ul,
.prose ol { padding-left: 1.2em; }
.prose ul { list-style: none; }
.prose ul > li { position: relative; padding-left: 1em; }
.prose ul > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 10px;
  height: 1px;
  background: var(--cyan-2);
}
.prose ol { list-style: decimal; }

.rule {
  height: 1px;
  border: 0;
  background: var(--line);
  margin-block: 48px;
}

/* ---------- 5. Header ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 10px 20px;
  background: var(--cyan);
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  transform: translateY(-220%);
  transition: transform var(--t-mid);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(11, 31, 26, 0.97);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* 品牌行 */
.brand-row {
  overflow: hidden;
  border-bottom: 1px solid var(--line-soft);
  padding-block: 16px;
  transition: padding var(--t-slow), opacity var(--t-slow);
}

.brand-row__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: none;
  padding: 6px 9px;
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  transform: skewX(-7deg);
  transition: background var(--t-mid);
}
.brand:hover .brand__mark { background: var(--paper); }

.brand__text { display: flex; flex-direction: column; min-width: 0; }

.brand__name {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--paper);
  white-space: nowrap;
}

.brand__tag {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist-2);
  white-space: nowrap;
}

.utility {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 32px);
  flex-wrap: wrap;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist-2);
}

.utility__item { display: inline-flex; align-items: baseline; gap: 0.5em; white-space: nowrap; }

.utility__key {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--brass);
}

/* 栏目行 */
.nav-row {
  position: relative;
  background: var(--ink);
}

.nav-row__inner {
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 16px 0;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: space-between;
  width: 18px;
  height: 12px;
}
.nav-toggle__bars > span {
  display: block;
  height: 1px;
  background: var(--cyan);
  transition: transform var(--t-mid), opacity var(--t-mid);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(1) { transform: translateY(5.5px) 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(-5.5px) rotate(-45deg); }

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 38px);
}

.primary-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 18px 0;
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.primary-nav__index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--mist-2);
  transition: color var(--t-mid);
}

.primary-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 10px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-fast);
}

.primary-nav__link:hover { color: var(--paper); }
.primary-nav__link:hover::after { transform: scaleX(1); }
.primary-nav__link:hover .primary-nav__index { color: var(--cyan); }

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

.kickoff {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  flex: none;
  border: 1px solid var(--line);
  border-radius: 50%;
  transition: border-color var(--t-mid), background var(--t-mid);
}
.kickoff__dot {
  width: 8px;
  height: 8px;
  background: var(--mist-2);
  transition: background var(--t-mid), transform var(--t-mid);
}
.kickoff:hover { border-color: var(--cyan); }
.kickoff:hover .kickoff__dot { background: var(--cyan); transform: scale(1.25); }

/* 滚动收起态 */
.site-header.is-condensed .brand-row { padding-block: 6px; }
.site-header.is-condensed .brand__tag { display: none; }
.site-header.is-condensed .utility { display: none; }
.site-header.is-condensed .brand__mark { font-size: 10px; padding: 4px 7px; }
.site-header.is-condensed .brand__name { font-size: 13px; }

/* 阅读进度线 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  pointer-events: none;
}
.scroll-progress__bar {
  height: 100%;
  width: 0;
  background: var(--cyan);
  transition: width 90ms linear;
}

/* ---------- 6. Footer ---------- */
.site-footer {
  position: relative;
  margin-top: 96px;
  background: var(--ink-3);
  border-top: 1px solid var(--line);
  padding-block: 64px 40px;
}

.footer-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

.footer-brand {
  font-size: clamp(1.4rem, 2.6vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.footer-brand__line {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--brass);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-bottom: 1px solid var(--line);
}

.footer-col { padding: 32px 28px 36px 0; }
.footer-col + .footer-col {
  border-left: 1px solid var(--line);
  padding-left: 28px;
}

.footer-col__title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--brass);
  margin-bottom: 18px;
}

.footer-col__list { display: flex; flex-direction: column; gap: 10px; font-size: 15px; }

.footer-col__list a {
  position: relative;
  display: inline-block;
  color: var(--mist);
}
.footer-col__list a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-fast);
}
.footer-col__list a:hover { color: var(--cyan); }
.footer-col__list a:hover::after { transform: scaleX(1); }

.footer-col__item { color: var(--mist-2); }

.contact-line { display: flex; gap: 10px; align-items: baseline; }
.contact-line__key {
  flex: none;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--mist-2);
}
.contact-line__val { color: var(--paper); font-size: 14px; line-height: 1.6; }

.footer-legal {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 28px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist-2);
}

.footer-legal__links { display: flex; gap: 22px; flex-wrap: wrap; }

.footer-legal__link {
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}
.footer-legal__link:hover { color: var(--cyan); border-bottom-color: var(--cyan-2); }

.to-top {
  position: fixed;
  right: 20px;
  bottom: 24px;
  z-index: 90;
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: 50%;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--t-mid), transform var(--t-mid), visibility var(--t-mid),
    border-color var(--t-mid);
}
.to-top[data-show] { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top:hover { border-color: var(--cyan); }
.to-top__icon {
  width: 9px;
  height: 9px;
  border-left: 1px solid var(--cyan);
  border-top: 1px solid var(--cyan);
  transform: rotate(45deg) translate(1px, 1px);
}

/* ---------- 7. Shared content components ---------- */
.crumb {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist-2);
}
.crumb a:hover { color: var(--cyan); }
.crumb__sep { color: var(--line-cyan); }

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--brass);
}

.section { padding-block: clamp(56px, 8vw, 112px); }

.section__head {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  gap: var(--gap);
  align-items: end;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
}

.section__title { max-width: 20em; }

.section__rail { display: flex; flex-direction: column; gap: 14px; }

.section-no {
  font-family: var(--font-mono);
  font-size: clamp(2.6rem, 6vw, 5.4rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.rail { display: flex; flex-direction: column; gap: 12px; }

.rail__link {
  display: block;
  padding-left: 14px;
  border-left: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist-2);
  transition: color var(--t-mid), border-color var(--t-mid), padding-left var(--t-mid);
}
.rail__link:hover { color: var(--paper); border-left-color: var(--mist-2); }
.rail__link.is-active {
  color: var(--cyan);
  border-left-color: var(--cyan);
  padding-left: 18px;
}

.metric-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.metric {
  background: var(--ink-2);
  padding: 26px 22px;
}

.metric__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--cyan);
}
.metric__value--paper { color: var(--paper); }
.metric__value--clay { color: var(--clay); }

.metric__label {
  display: block;
  margin-top: 12px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist-2);
}

.tag {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  border: 1px solid currentColor;
  color: var(--mist-2);
  white-space: nowrap;
}
.tag--clay { color: var(--clay); }
.tag--brass { color: var(--brass); }
.tag--cyan { color: var(--cyan); }

.slab {
  position: relative;
  padding: clamp(40px, 6vw, 80px) clamp(24px, 4vw, 56px);
  background: var(--ink-2);
  border: 1px solid var(--line);
  clip-path: polygon(0 2.2%, 100% 0, 100% 97.8%, 0 100%);
}
.slab--wine { background: var(--wine); border-color: rgba(244, 247, 245, 0.16); }
.slab--indigo { background: var(--indigo); border-color: rgba(244, 247, 245, 0.16); }
.slab--cyan { background: var(--cyan-2); border-color: rgba(7, 20, 16, 0.3); }

.paper-card {
  position: relative;
  background: var(--ink-2);
  border: 1px solid var(--line);
  padding: clamp(24px, 3vw, 40px);
  transition: border-color var(--t-mid), transform var(--t-mid), background var(--t-mid);
}
.paper-card::before {
  content: "";
  position: absolute;
  inset: 5px -5px -5px 5px;
  border: 1px solid var(--line-soft);
  z-index: -1;
  transition: inset var(--t-mid), border-color var(--t-mid);
}
.paper-card:hover { border-color: var(--cyan-2); background: #122F27; }
.paper-card:hover::before { inset: 9px -9px -9px 9px; border-color: var(--line-cyan); }

.paper-card__corner {
  position: absolute;
  top: 0;
  right: 0;
  width: 22px;
  height: 22px;
  border-left: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--ink);
}

.timeline {
  border-left: 1px solid var(--line);
  padding-left: 24px;
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.timeline__item { position: relative; }
.timeline__item::before {
  content: "";
  position: absolute;
  left: -29px;
  top: 0.65em;
  width: 9px;
  height: 9px;
  border: 1px solid var(--cyan-2);
  background: var(--ink);
  transition: background var(--t-mid), border-color var(--t-mid);
}
.timeline__item:hover::before { background: var(--cyan); border-color: var(--cyan); }
.timeline__stamp {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist-2);
}

.table {
  font-size: 14px;
  border: 1px solid var(--line);
}
.table th {
  text-align: left;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--brass);
  padding: 14px 16px;
  background: var(--ink-2);
  border-bottom: 1px solid var(--line);
}
.table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line-soft);
  color: var(--mist);
}
.table tbody tr { transition: background var(--t-mid); }
.table tbody tr:hover { background: var(--ink-2); }
.table tbody tr:hover td { color: var(--paper); }
.table td .num { font-family: var(--font-mono); letter-spacing: 0.04em; color: var(--cyan); }

/* 图片容器基础规则（页面阶段放置图片） */
.media {
  position: relative;
  overflow: hidden;
  background: var(--ink-2);
  border: 1px solid var(--line);
}
.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.65) contrast(1.06) brightness(0.86);
  transition: transform var(--t-slow), filter var(--t-slow);
}
.media:hover .media__img { transform: scale(1.02); filter: saturate(0.8) contrast(1.06) brightness(0.95); }
.media__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  right: 0;
  padding: 10px 14px;
  background: linear-gradient(to top, rgba(7, 20, 16, 0.92), rgba(7, 20, 16, 0));
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}
.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--portrait { aspect-ratio: 3 / 4; }

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 520ms var(--ease), transform 520ms var(--ease);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ---------- 8. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  padding: 0.85em 1.7em;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--cyan);
  background: transparent;
  border: 1px solid var(--cyan-2);
  transition: background var(--t-mid), color var(--t-mid), border-color var(--t-mid);
}
.btn:hover { background: var(--cyan-2); color: var(--paper); border-color: var(--cyan-2); }

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

.btn--clay { background: var(--clay); color: var(--paper); border-color: var(--clay); }
.btn--clay:hover { background: #A8421F; border-color: #A8421F; color: var(--paper); }

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

/* ---------- 9. Responsive ---------- */
@media (max-width: 1100px) and (min-width: 901px) {
  .col-3, .col-4 { grid-column: span 6; }
  .col-5, .col-7 { grid-column: span 12; }
}

@media (max-width: 900px) {
  body { font-size: 16px; }

  .brand-row { padding-block: 12px; }
  .utility { display: none; }

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

  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    background: var(--ink-2);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.55);
  }
  .primary-nav[data-open] { display: block; }

  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px var(--gutter) 24px;
  }
  .primary-nav__link {
    display: flex;
    align-items: baseline;
    gap: 14px;
    padding: 15px 0;
    border-bottom: 1px solid var(--line-soft);
    font-size: 15px;
  }
  .primary-nav__link::after { display: none; }
  .primary-nav__link[aria-current="page"] { border-bottom-color: var(--cyan); }

  .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8 { grid-column: span 6; }

  .section__head { grid-template-columns: 1fr; align-items: start; }

  .footer-grid { grid-template-columns: 1fr; }
  .footer-col { padding: 26px 0; }
  .footer-col + .footer-col {
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-left: 0;
  }

  .footer-legal { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 560px) {
  .brand__tag { display: none; }
  .to-top { right: 14px; bottom: 18px; width: 40px; height: 40px; }
  .metric { padding: 20px 18px; }
}

/* ---------- 10. Reduced motion ---------- */
@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;
  }
  .reveal { opacity: 1; transform: none; }
  .scroll-progress__bar { transition: none; }
}