/* ==========================================================================
   美博赛场 · 共享站台样式 (site.css)
   夜间球场指挥台：框架刻度 / 切角面板 / 等宽索引 / 暖纸阅读区
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root {
  --ink: #061F19;
  --ink-deep: #020B09;
  --ink-mid: #0B3A30;
  --paper: #F1E6D2;
  --paper-hi: #FFF7E8;
  --neon: #21F6CF;
  --teal: #0C8A76;
  --ember: #FF8A3D;
  --line: #6E8F7B;
  --mist: #A9C2B6;

  --line-18: rgba(110, 143, 123, .18);
  --line-22: rgba(110, 143, 123, .22);
  --line-35: rgba(110, 143, 123, .35);
  --line-55: rgba(110, 143, 123, .55);

  --font-display: "Barlow Condensed", "Oswald", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;

  --maxw: 1240px;
  --gutter: clamp(16px, 3.6vw, 44px);
  --frame: 14px;
  --ease: cubic-bezier(.22, .7, .3, 1);
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: clamp(15px, .35vw + 13.8px, 17px);
  line-height: 1.75;
  letter-spacing: .01em;
  color: var(--paper);
  background-color: var(--ink);
  background-image:
    radial-gradient(1100px 620px at 86% -10%, rgba(33, 246, 207, .10), transparent 62%),
    radial-gradient(880px 540px at -8% 104%, rgba(255, 138, 61, .08), transparent 60%),
    linear-gradient(180deg, #061F19 0%, #041914 52%, #061F19 100%);
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: .01em;
  color: var(--paper-hi);
  text-wrap: balance;
}

p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
figure { margin: 0; }
img, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
summary { cursor: pointer; }
a { color: var(--neon); text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
::selection { background: var(--neon); color: #04211B; }

:where(a, button, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 3. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: #04211B;
  background: var(--neon);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transform: translateY(-160%);
  transition: transform .18s var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible { transform: none; }

/* ---------- 4. 框架刻度（左侧球场边线） ---------- */
.frame-rail { display: none; }

@media (min-width: 1100px) {
  body { padding-inline-start: var(--frame); }

  .frame-rail {
    display: block;
    position: fixed;
    inset-block: 0;
    inset-inline-start: 0;
    width: var(--frame);
    z-index: 70;
    pointer-events: none;
    background: linear-gradient(180deg, #020B09 0%, #06231B 50%, #020B09 100%);
    border-inline-end: 1px solid var(--line-35);
  }

  .frame-rail::after {
    content: "";
    position: absolute;
    inset: 0;
    background-image: repeating-linear-gradient(180deg,
      rgba(33, 246, 207, .6) 0 1px,
      transparent 1px 56px);
    opacity: .7;
  }
}

/* ---------- 5. 头部框架 ---------- */
.masthead {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, #020B09 0%, #06231B 100%);
  border-block-end: 1px solid var(--line-55);
  box-shadow: 0 16px 34px -26px rgba(0, 0, 0, .95);
}

.masthead__bar {
  position: relative;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 10px var(--gutter) 12px;
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 26px);
  border-block-end: 1px solid var(--line-22);
}

.masthead__bar::after {
  content: "";
  position: absolute;
  inset-inline: var(--gutter);
  bottom: -1px;
  height: 5px;
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 24px);
  opacity: .45;
  pointer-events: none;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
  color: var(--paper-hi);
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
  color: #04211B;
  background: linear-gradient(145deg, var(--neon) 0%, var(--teal) 100%);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 1.5vw, 21px);
  letter-spacing: .14em;
  color: var(--paper-hi);
  transition: color .18s var(--ease);
}

.brand:hover .brand__name { color: var(--neon); }

.brand__line {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: .2em;
  color: var(--mist);
  white-space: nowrap;
}

.masthead__descriptor {
  margin-inline-start: auto;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  color: var(--mist);
  white-space: nowrap;
}

/* 移动目录按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-inline-start: auto;
  padding: 8px 13px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--paper);
  border: 1px solid var(--line-55);
  background: rgba(11, 58, 48, .35);
  clip-path: polygon(0 0, calc(100% - 9px) 0, 100% 9px, 100% 100%, 0 100%);
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.nav-toggle:hover {
  color: var(--neon);
  border-color: var(--neon);
  background: rgba(33, 246, 207, .08);
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 11px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1.5px;
  background: currentColor;
  transition: transform .2s var(--ease);
}

.nav-toggle__bars::before { top: 1px; }
.nav-toggle__bars::after { bottom: 1px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-4px) rotate(-45deg); }

/* 主导航 */
.sitenav {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.sitenav__list {
  display: flex;
  align-items: stretch;
  flex-wrap: wrap;
  min-width: 0;
}

.sitenav__item { display: flex; }

.sitenav__link {
  position: relative;
  display: flex;
  align-items: center;
  padding: 13px clamp(10px, 1.2vw, 20px);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: .1em;
  color: var(--mist);
  border-inline-start: 1px solid var(--line-18);
  transition: color .18s var(--ease), background-color .18s var(--ease);
}

.sitenav__item:first-child .sitenav__link { border-inline-start: 0; }

.sitenav__link::after {
  content: "";
  position: absolute;
  inset-inline: clamp(10px, 1.2vw, 20px);
  bottom: 6px;
  height: 2px;
  background: var(--teal);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .2s var(--ease), background-color .2s var(--ease);
}

.sitenav__link:hover {
  color: var(--paper-hi);
  background-color: rgba(11, 58, 48, .55);
}

.sitenav__link:hover::after { transform: scaleX(1); }

.sitenav__link[aria-current="page"] {
  color: var(--neon);
  background-color: rgba(33, 246, 207, .06);
}

.sitenav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--neon);
}

.sitenav__cta { flex: 0 0 auto; }

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  inset-inline: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--teal) 0%, var(--neon) 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

/* 移动端侧滑目录 */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 70;
  background: rgba(2, 11, 9, .74);
  border: 0;
}
.nav-scrim[hidden] { display: none; }

@media (max-width: 899px) {
  .masthead__descriptor { display: none; }
  .nav-toggle { display: inline-flex; }

  .sitenav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(84vw, 330px);
    z-index: 80;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: 22px calc(var(--gutter) * .8) 30px;
    background: linear-gradient(180deg, #020B09 0%, #062019 68%, #020B09 100%);
    border-inline-start: 1px solid var(--line-55);
    overflow-y: auto;
    transform: translateX(104%);
    visibility: hidden;
    transition: transform .22s var(--ease), visibility .22s var(--ease);
  }

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

  .sitenav__list {
    flex-direction: column;
    width: 100%;
    margin-top: 10px;
  }

  .sitenav__item { width: 100%; }

  .sitenav__link {
    width: 100%;
    padding: 15px 4px;
    font-size: 19px;
    letter-spacing: .12em;
    border-inline-start: 0;
    border-block-end: 1px solid var(--line-22);
  }

  .sitenav__link::after {
    inset-inline: 4px auto;
    width: 34px;
    bottom: 11px;
  }

  .sitenav__cta {
    margin-top: 24px;
    justify-content: center;
    width: 100%;
  }
}

@media (min-width: 900px) {
  .nav-toggle { display: none; }
  .nav-scrim { display: none; }
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5em;
  padding: 10px 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .12em;
  line-height: 1.2;
  border: 1px solid transparent;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  transition: transform .18s var(--ease), background-color .18s var(--ease),
              color .18s var(--ease), border-color .18s var(--ease);
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--signal {
  color: #04211B;
  background: var(--neon);
  border-color: var(--neon);
}
.btn--signal:hover { background: #5CFFE2; }

.btn--ember {
  color: #22100A;
  background: var(--ember);
  border-color: var(--ember);
}
.btn--ember:hover { background: #FFA365; }

.btn--ghost {
  color: var(--paper);
  background: transparent;
  border-color: var(--line-55);
}
.btn--ghost:hover {
  color: var(--neon);
  border-color: var(--neon);
}

.btn--block { width: 100%; }

/* ---------- 7. 版式与布局工具 ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(40px, 7vw, 88px); }

.grid { display: grid; gap: clamp(16px, 2.2vw, 28px); }

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

@media (min-width: 820px) {
  .grid--split { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--neon);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  flex: 0 0 auto;
}

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--line-35);
}

.rule--ticked {
  height: 8px;
  background: none;
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 40px);
  opacity: .6;
}

/* ---------- 8. 面板 ---------- */
.panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 30px);
  background: linear-gradient(160deg, rgba(11, 58, 48, .88) 0%, rgba(6, 31, 25, .94) 100%);
  border: 1px solid var(--line-35);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
  transition: border-color .18s var(--ease), transform .18s var(--ease);
}

.panel:hover { border-color: var(--neon); }

.panel--paper {
  background: var(--paper);
  color: #14261E;
  border-color: rgba(20, 38, 30, .22);
}

.panel--paper a { color: #0B6A57; }
.panel--paper a:hover { color: #0C8A76; }
.panel--paper h2,
.panel--paper h3,
.panel--paper h4 { color: #0A1A14; }

/* ---------- 9. 图片容器基础规则 ---------- */
.media {
  position: relative;
  overflow: hidden;
  display: block;
  isolation: isolate;
  background-color: #08251E;
  background-image:
    radial-gradient(circle at 28% 18%, rgba(33, 246, 207, .18), transparent 55%),
    radial-gradient(circle at 78% 84%, rgba(255, 138, 61, .16), transparent 58%),
    repeating-linear-gradient(135deg, rgba(110, 143, 123, .12) 0 1px, transparent 1px 12px);
  border: 1px solid var(--line-35);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

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

.media--wide { aspect-ratio: 16 / 9; }
.media--hero { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }

.media__caption {
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  color: var(--paper);
  background: linear-gradient(18deg, rgba(2, 11, 9, .9) 0%, rgba(2, 11, 9, 0) 100%);
}

.media__tag {
  position: absolute;
  top: 10px;
  left: 10px;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .18em;
  color: #04211B;
  background: var(--neon);
  clip-path: polygon(0 0, calc(100% - 7px) 0, 100% 7px, 100% 100%, 0 100%);
}

@media (max-width: 640px) {
  .media--hero { aspect-ratio: 4 / 3; }
}

/* ---------- 10. 面包屑 ---------- */
.crumbs { padding-block: 16px 0; }

.crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--mist);
}

.crumbs__list li + li::before {
  content: "/";
  margin-inline-end: 8px;
  color: var(--line);
}

.crumbs__list a {
  color: var(--mist);
  border-block-end: 1px solid transparent;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.crumbs__list a:hover {
  color: var(--neon);
  border-color: var(--neon);
}

.crumbs__list [aria-current="page"] { color: var(--paper-hi); }

/* ---------- 11. 页脚 ---------- */
.sitefoot {
  position: relative;
  margin-top: clamp(56px, 9vw, 120px);
  color: var(--mist);
  background: linear-gradient(180deg, #020B09 0%, #04150F 48%, #020B09 100%);
  border-block-start: 1px solid var(--line-55);
}

.sitefoot::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 6px;
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 32px);
  opacity: .5;
  pointer-events: none;
}

.sitefoot__inner {
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(34px, 5vw, 60px) var(--gutter) clamp(28px, 4vw, 44px);
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 1fr));
  gap: clamp(26px, 3.4vw, 48px);
}

.sitefoot__brand { min-width: 0; }

.sitefoot__wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1;
  letter-spacing: .12em;
  color: var(--paper-hi);
}

.sitefoot__summary {
  margin-top: 14px;
  max-width: 34ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}

.sitefoot__badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  color: var(--line);
}

.sitefoot__dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 3px rgba(33, 246, 207, .16);
}

.sitefoot__cta { margin-top: 22px; }

.sitefoot__col {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.sitefoot__title {
  padding-bottom: 10px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .24em;
  color: var(--neon);
  border-block-end: 1px solid var(--line-35);
}

.sitefoot__list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.sitefoot__link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 14.5px;
  color: var(--mist);
  transition: color .16s var(--ease);
}

.sitefoot__link::before {
  content: "";
  width: 10px;
  height: 1px;
  flex: 0 0 auto;
  background: var(--line);
  transition: width .16s var(--ease), background-color .16s var(--ease);
}

.sitefoot__link:hover { color: var(--paper-hi); }
.sitefoot__link:hover::before { width: 18px; background: var(--neon); }

.sitefoot__meta {
  display: grid;
  gap: 10px;
  font-size: 13.5px;
  line-height: 1.7;
}

.sitefoot__meta li {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 8px;
  align-items: baseline;
}

.sitefoot__meta-key {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .2em;
  color: var(--line);
}

.sitefoot__meta-val {
  color: var(--paper);
  word-break: break-word;
}

.sitefoot__meta li.sitefoot__meta-note {
  grid-template-columns: 1fr;
  font-size: 12.5px;
  color: var(--mist);
  padding-top: 8px;
  border-block-start: 1px solid var(--line-22);
}

.sitefoot__legal {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
  padding-block-end: clamp(26px, 4vw, 40px);
}

.sitefoot__legal-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 20px;
  padding-block-start: 18px;
  border-block-start: 1px solid var(--line-22);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--mist);
}

.sitefoot__copy,
.sitefoot__icp { margin: 0; }

.sitefoot__sep { color: var(--line); }

.sitefoot__legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-inline-start: auto;
}

.sitefoot__legal-link {
  color: var(--mist);
  border-block-end: 1px solid transparent;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.sitefoot__legal-link:hover {
  color: var(--neon);
  border-color: var(--neon);
}

@media (max-width: 1023px) {
  .sitefoot__inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .sitefoot__brand { grid-column: 1 / -1; }
}

@media (max-width: 600px) {
  .sitefoot__inner { grid-template-columns: minmax(0, 1fr); }
  .sitefoot__legal-links { margin-inline-start: 0; }
}

/* ---------- 12. 一次性显现 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}

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

/* ---------- 13. 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

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

  .btn:hover,
  .panel:hover { transform: none; }
}