/* ==========================================================================
   威廉体育看台 · 共享样式 site.css
   墨绿看台 + 海报式分层 + 侧边轨道导航 + 档案网格
   ========================================================================== */

/* ---------- 1. reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body,
h1, h2, h3, h4, h5,
p, ul, ol, li,
figure, blockquote, dl, dd, figcaption {
  margin: 0;
}

ul[class],
ol[class] { list-style: none; padding: 0; }

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

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

a { color: inherit; }

main { display: block; }

/* ---------- 2. tokens ---------- */
:root {
  --ink-950: #0B1512;
  --pitch-900: #12241D;
  --carbon-800: #1C1F1E;
  --paper-100: #F2EBDD;
  --ember-500: #FF4D1C;
  --ember-300: #FF8A5C;
  --steel-400: #8FA6B8;
  --steel-700: #3E5566;
  --card-yellow: #F2C230;
  --card-red: #D92D20;
  --text-primary: #F5F1E8;
  --text-muted: #A9B4AE;

  --rail-w: 92px;
  --topbar-h: 60px;
  --maxw: 1260px;
  --gutter: clamp(20px, 3vw, 40px);
  --line-c: rgba(62, 85, 102, 0.55);

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

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. base ---------- */
html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  padding-left: var(--rail-w);
  padding-top: var(--topbar-h);
  background-color: var(--ink-950);
  background-image:
    linear-gradient(to right, rgba(62, 85, 102, 0.16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(62, 85, 102, 0.1) 1px, transparent 1px);
  background-size: 88px 88px, 88px 88px;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  word-break: keep-all;
  line-break: strict;
}

p { text-wrap: pretty; }

::selection {
  background: var(--ember-500);
  color: var(--ink-950);
}

:focus-visible {
  outline: 2px solid var(--ember-300);
  outline-offset: 3px;
}

#main-content { scroll-margin-top: calc(var(--topbar-h) + 16px); }

/* ---------- 4. 共享版式与组件 ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: clamp(44px, 6vw, 92px);
}

.section + .section {
  border-top: 1px solid var(--line-c);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--steel-400);
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--ember-500);
}

.display {
  font-size: clamp(40px, 7.6vw, 112px);
  line-height: 0.94;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--text-primary);
}

.lede {
  max-width: 38ch;
  font-size: clamp(16px, 1.4vw, 19px);
  line-height: 1.75;
  color: var(--text-muted);
}

.mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
}

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

.grid {
  display: grid;
  gap: clamp(18px, 2.4vw, 32px);
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(168px, 1fr)); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid var(--steel-700);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  text-decoration: none;
  transition: background-color 0.16s var(--ease), border-color 0.16s var(--ease),
    color 0.16s var(--ease);
}

.btn--ember {
  background: var(--ember-500);
  border-color: var(--ember-500);
  color: var(--ink-950);
  font-weight: 700;
}

.btn--ember:hover,
.btn--ember:focus-visible {
  background: var(--ember-300);
  border-color: var(--ember-300);
}

.btn--line:hover,
.btn--line:focus-visible {
  border-color: var(--ember-500);
  color: var(--ember-300);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid currentColor;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: 0.08em;
  color: var(--steel-400);
}

.tag--ember { color: var(--ember-500); }
.tag--yellow { color: var(--card-yellow); }
.tag--red { color: var(--card-red); }
.tag--steel { color: var(--steel-400); }

.breadcrumb { margin-block: 26px; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--steel-400);
}

.breadcrumb__list li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--steel-700);
}

.breadcrumb a {
  color: var(--steel-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--ember-300);
  border-bottom-color: var(--ember-500);
}

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

.panel {
  background: var(--carbon-800);
  border: 1px solid var(--line-c);
  padding: clamp(18px, 2.4vw, 28px);
}

.stat {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  background: var(--pitch-900);
  border-left: 3px solid var(--ember-500);
}

.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3vw, 38px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--text-primary);
}

.stat__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--steel-400);
}

/* 图片容器基础规则（页面阶段放入图片占位） */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--carbon-800);
  border: 1px solid var(--line-c);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(143, 166, 184, 0.16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(143, 166, 184, 0.1) 1px, transparent 1px);
  background-size: 44px 44px, 44px 44px;
  opacity: 0.7;
}

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

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }

/* ---------- 5. 页头 ---------- */
.site-header { position: static; }

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 120;
  padding: 10px 16px;
  background: var(--ember-500);
  color: var(--ink-950);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-decoration: none;
  transform: translateY(-190%);
  transition: transform 0.18s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--paper-100);
  outline-offset: 3px;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 130;
  width: 100%;
  height: 3px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--ember-300), var(--ember-500) 62%, var(--card-yellow));
  pointer-events: none;
}

/* 记分牌横条 */
.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 0 22px 0 20px;
  background: linear-gradient(90deg, var(--ink-950) 0%, var(--pitch-900) 58%, var(--ink-950) 100%);
  border-bottom: 1px solid var(--line-c);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--ember-500);
  color: var(--ink-950);
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  line-height: 1;
}

.brand__text { display: block; }

.brand__name {
  display: block;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.06em;
  line-height: 1.2;
  color: var(--text-primary);
}

.brand__meta {
  display: block;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  line-height: 1.5;
  color: var(--steel-400);
}

.topbar__utility {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 2px;
}

.topbar__label {
  margin-right: 10px;
  padding-right: 12px;
  border-right: 1px solid var(--line-c);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  color: var(--steel-400);
}

.util-link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 8px 12px;
  border: 1px solid transparent;
  font-size: 14px;
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease),
    background-color 0.16s var(--ease);
}

.util-link__num {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--ember-500);
}

.util-link:hover,
.util-link:focus-visible {
  color: var(--ember-300);
  border-color: var(--steel-700);
  background: rgba(255, 77, 28, 0.08);
}

/* 抽屉开关 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 9px 13px;
  border: 1px solid var(--steel-700);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  transition: border-color 0.16s var(--ease), color 0.16s var(--ease);
}

.nav-toggle__icon { display: grid; gap: 4px; }

.nav-toggle__bar {
  display: block;
  width: 16px;
  height: 1.5px;
  background: var(--ember-500);
  transition: transform 0.16s var(--ease), opacity 0.16s var(--ease);
}

.nav-toggle[aria-expanded="true"] { border-color: var(--ember-500); color: var(--ember-300); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:first-child { transform: translateY(2.75px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:last-child { transform: translateY(-2.75px) rotate(-45deg); }

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 78;
  background: rgba(6, 12, 10, 0.68);
}

.nav-scrim[hidden] { display: none; }

/* 侧边轨道导航（桌面） */
.site-nav {
  position: fixed;
  top: var(--topbar-h);
  left: 0;
  bottom: 0;
  z-index: 55;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  padding: 18px 0 16px;
  overflow-y: auto;
  background: rgba(11, 21, 18, 0.94);
  border-right: 1px solid var(--line-c);
  scrollbar-width: thin;
}

.site-nav__head {
  margin-bottom: 14px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: 0.16em;
  color: var(--steel-400);
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
}

.site-nav__item { width: 100%; }

.site-nav__link {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 12px 4px;
  border-left: 3px solid transparent;
  color: var(--steel-400);
  text-decoration: none;
  transition: color 0.16s var(--ease), background-color 0.16s var(--ease),
    border-color 0.16s var(--ease);
}

.site-nav__num {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  opacity: 0.75;
}

.site-nav__label {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: 0.18em;
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--text-primary);
  background: rgba(143, 166, 184, 0.07);
}

.site-nav__link[aria-current="page"] {
  color: var(--text-primary);
  border-left-color: var(--ember-500);
  background: linear-gradient(90deg, rgba(255, 77, 28, 0.16), rgba(255, 77, 28, 0));
}

.site-nav__link[aria-current="page"] .site-nav__num {
  color: var(--ember-500);
  opacity: 1;
}

.site-nav__foot {
  display: none;
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: var(--steel-700);
}

/* ---------- 6. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(72px, 9vw, 128px);
  padding: 60px var(--gutter) 30px;
  background: var(--pitch-900);
  border-top: 1px solid var(--line-c);
  color: var(--text-muted);
  font-size: 14px;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 168px;
  height: 3px;
  background: var(--ember-500);
}

.footer__grid {
  max-width: var(--maxw);
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr 1fr;
  gap: 34px 28px;
  align-items: start;
}

.footer__mark {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background: var(--ember-500);
  color: var(--ink-950);
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  line-height: 1;
}

.footer__name {
  margin-top: 14px;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--text-primary);
}

.footer__tag {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--steel-400);
}

.footer__brand-note {
  margin-top: 14px;
  max-width: 26ch;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-muted);
}

.footer__col { min-width: 0; }

.footer__title {
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-c);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--steel-400);
}

.footer__list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer__list li { display: flex; align-items: baseline; gap: 8px; }

.footer__list li::before {
  content: "";
  flex: 0 0 auto;
  width: 7px;
  height: 1px;
  background: var(--steel-700);
  transform: translateY(-3px);
}

.footer__list a {
  font-size: 14px;
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.16s var(--ease);
}

.footer__list a:hover,
.footer__list a:focus-visible { color: var(--ember-300); }

.footer__bar {
  max-width: var(--maxw);
  margin: 42px auto 0;
  padding-top: 26px;
  border-top: 1px solid var(--line-c);
  display: grid;
  grid-template-columns: 2.2fr 1fr;
  gap: 26px 44px;
  align-items: start;
}

.footer__contact {
  display: grid;
  gap: 8px;
  max-width: 66ch;
}

.footer__contact-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  font-size: 13px;
}

.footer__k {
  min-width: 66px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--steel-400);
}

.footer__v {
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.65;
  letter-spacing: 0.02em;
  color: var(--text-primary);
}

.footer__hours {
  margin-top: 4px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--text-muted);
}

.footer__legal {
  display: grid;
  justify-items: start;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--steel-400);
}

.footer__legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer__legal-links a {
  color: var(--steel-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

.footer__legal-links a:hover,
.footer__legal-links a:focus-visible {
  color: var(--ember-300);
  border-bottom-color: var(--ember-500);
}

.footer__icp { color: var(--steel-400); }
.footer__copy { color: var(--steel-400); opacity: 0.72; }

/* 返回顶部 */
.to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  background: var(--carbon-800);
  border: 1px solid var(--steel-700);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 0.18s var(--ease), transform 0.18s var(--ease),
    border-color 0.18s var(--ease), background-color 0.18s var(--ease),
    color 0.18s var(--ease);
}

.to-top.is-on {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}

.to-top:hover,
.to-top:focus-visible {
  border-color: var(--ember-500);
  background: var(--ink-950);
  color: var(--ember-300);
}

.to-top__arrow { font-size: 13px; color: var(--ember-500); }

/* ---------- 7. 显现动效协议 ---------- */
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.22s var(--ease), transform 0.22s var(--ease);
}

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

/* ---------- 8. 响应式 ---------- */
@media (max-width: 1180px) {
  .topbar__label { display: none; }
  .footer__grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; }
}

@media (max-width: 1040px) {
  .brand__meta { display: none; }
  .footer__grid { grid-template-columns: 1fr 1fr 1fr; }
  .footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 899px) {
  :root { --topbar-h: 56px; }

  body {
    padding-left: 0;
    font-size: 16px;
    background-size: 64px 64px, 64px 64px;
  }

  .topbar {
    z-index: 90;
    padding-inline: 16px;
    gap: 12px;
  }

  .topbar__utility { display: none; }

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

  /* 抽屉 */
  .site-nav,
  .site-nav[data-open="false"] {
    top: 0;
    right: auto;
    width: min(330px, 86vw);
    padding: 76px 0 26px;
    visibility: hidden;
    transform: translateX(-102%);
    background: var(--ink-950);
    border-right: 1px solid var(--steel-700);
    box-shadow: 26px 0 70px rgba(0, 0, 0, 0.55);
    z-index: 80;
    transition: transform 0.2s var(--ease), visibility 0.2s var(--ease);
  }

  .site-nav[data-open="true"] {
    visibility: visible;
    transform: translateX(0);
  }

  .site-nav__head {
    margin: 0 0 12px;
    padding-inline: 20px;
    text-align: left;
    font-size: 10px;
    letter-spacing: 0.2em;
  }

  .site-nav__list { align-items: stretch; gap: 0; }

  .site-nav__link {
    flex-direction: row;
    align-items: baseline;
    justify-content: flex-start;
    gap: 14px;
    padding: 14px 20px;
    border-left: 3px solid transparent;
    border-bottom: 1px solid rgba(62, 85, 102, 0.35);
  }

  .site-nav__link[aria-current="page"] {
    border-left-color: var(--ember-500);
    background: linear-gradient(90deg, rgba(255, 77, 28, 0.2), rgba(255, 77, 28, 0));
  }

  .site-nav__num { font-size: 11px; opacity: 0.9; }

  .site-nav__label {
    writing-mode: horizontal-tb;
    font-size: 16px;
    letter-spacing: 0.08em;
  }

  .site-nav__foot {
    display: block;
    margin-top: auto;
    padding: 24px 20px 0;
    font-size: 10px;
  }

  body.nav-open { overflow: hidden; }

  .footer__bar { grid-template-columns: 1fr; gap: 22px; }

  .to-top { right: 14px; bottom: 14px; }
}

@media (max-width: 680px) {
  .footer__grid { grid-template-columns: 1fr 1fr; gap: 28px 20px; }
  .brand__name { font-size: 15.5px; letter-spacing: 0.04em; }
  .brand__mark { width: 30px; height: 30px; font-size: 14px; }
  .footer__k { min-width: 60px; }
  .footer__v { font-size: 12px; }
  .to-top__text { display: none; }
  .to-top { padding: 10px 12px; }
}

/* ---------- 9. 减少动态效果 ---------- */
@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;
  }

  .js-reveal [data-reveal] { opacity: 1 !important; transform: none !important; }
  .to-top { transform: none !important; }
}