/* =========================================================
   B体育 · 共享样式 /assets/site.css
   深夜数据台：锐利直角、1px 精密网格、三色高亮受控
   ========================================================= */

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

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

body {
  margin: 0;
  background-color: var(--ink-950);
  background-image:
    linear-gradient(90deg, var(--grid) 1px, transparent 1px),
    linear-gradient(180deg, var(--grid) 1px, transparent 1px);
  background-size: 104px 104px, 104px 104px;
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body[data-nav-lock="true"] { overflow: hidden; }

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

button { font: inherit; color: inherit; }

a { color: var(--cyan); }

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--paper);
}

p { margin: 0; }

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

hr { border: 0; }

:target { scroll-margin-top: calc(var(--header-h) + 18px); }

:where(a, button, input, select, textarea, [tabindex]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 变量 ---------- */
:root {
  color-scheme: dark;

  --ink-950: #06110F;
  --ink-900: #081613;
  --ink-800: #0B2420;
  --ink-700: #123A33;

  --cyan: #2BE0C8;
  --cyan-soft: #7CF3DE;
  --amber: #F2B33D;
  --rose: #E8557A;

  --paper: #E8F1EC;
  --muted: #8FA9A2;
  --line: rgba(201, 216, 210, 0.16);
  --line-strong: rgba(201, 216, 210, 0.34);
  --grid: rgba(201, 216, 210, 0.045);

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC",
    "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-serif: "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC",
    Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;

  --pad-x: clamp(1.1rem, 4vw, 3.2rem);
  --header-h: 66px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 中文排版基础 ---------- */
.prose { max-width: 36em; }
.prose p { font-size: 1.02rem; line-height: 1.78; color: var(--paper); }
.prose p + p { margin-top: 0.9em; }
.prose h2 { font-size: clamp(1.3rem, 2.2vw, 1.7rem); margin-top: 1.9em; margin-bottom: 0.7em; }
.prose h3 { font-size: 1.15rem; margin-top: 1.6em; margin-bottom: 0.6em; }

.lead {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  line-height: 1.7;
  color: var(--muted);
  max-width: 34em;
}

.numeric {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.serif {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: 0.01em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--cyan);
  flex: none;
}

/* ---------- 容器与网格 ---------- */
.container {
  width: 100%;
  max-width: 1240px;
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.container--narrow { max-width: 880px; }

.grid { display: grid; gap: clamp(1rem, 2.4vw, 2rem); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

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

.section { padding-block: clamp(2.4rem, 5vw, 4.6rem); }
.section + .section { border-top: 1px solid var(--line); }
.section__head {
  display: grid;
  gap: 0.7rem;
  margin-bottom: clamp(1.2rem, 2.6vw, 2rem);
}
.section__title {
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  font-weight: 900;
}
.section__lead {
  color: var(--muted);
  max-width: 36em;
  font-size: 0.98rem;
  line-height: 1.72;
}

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

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 0.6rem;
  left: 0.6rem;
  z-index: 200;
  transform: translateY(-180%);
  padding: 0.6rem 1rem;
  background: var(--cyan);
  color: #04120F;
  font-size: 0.86rem;
  font-weight: 700;
  text-decoration: none;
  transition: transform 0.2s var(--ease);
}
.skip-link:focus { transform: none; }

/* ---------- 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(6, 17, 15, 0.74);
  border-bottom: 1px solid var(--line);
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease);
}
.site-header[data-scrolled="true"] {
  background: var(--ink-800);
  border-bottom-color: var(--line-strong);
}

.site-header__grid {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  column-gap: clamp(1rem, 2.5vw, 2.4rem);
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  flex-direction: column;
  gap: 0.18rem;
  align-self: center;
  text-decoration: none;
  color: var(--paper);
  line-height: 1;
  padding-block: 0.35rem;
}
.brand__mark {
  font-size: 1.28rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  transition: color 0.18s var(--ease);
}
.brand__mark::before {
  content: "";
  display: inline-block;
  width: 0.4em;
  height: 0.4em;
  margin-right: 0.42em;
  background: var(--cyan);
  transform: translateY(-0.1em);
}
.brand__sub {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.07em;
  text-transform: lowercase;
  color: var(--muted);
}
.brand:hover .brand__mark { color: var(--cyan); }
.brand:hover .brand__sub { color: var(--cyan-soft); }

.site-nav { justify-self: end; }

.site-nav__list {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-nav__item { display: flex; }
.site-nav__item + .site-nav__item { border-left: 1px solid var(--line); }
.site-nav__link {
  display: block;
  padding: 0.55rem clamp(0.6rem, 1.05vw, 0.95rem);
  font-size: 0.93rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}
.site-nav__link:hover {
  color: var(--cyan-soft);
  background: var(--ink-700);
}
.site-nav__link[aria-current="page"] {
  color: var(--cyan);
  background: var(--ink-700);
  box-shadow: inset 0 -2px 0 0 var(--cyan);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  justify-self: end;
}
.header-cta { display: inline-flex; }

/* ---------- 移动抽屉按钮 ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.7rem;
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.nav-toggle:hover { color: var(--cyan); border-color: var(--cyan); }
.nav-toggle__label { font-size: 0.82rem; }
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 1px;
  background: currentColor;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1px;
  background: currentColor;
  transition: transform 0.2s var(--ease);
}
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  transform: translateY(5px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  transform: translateY(-5px) rotate(-45deg);
}

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

/* ---------- 抽屉与遮罩 ---------- */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 110;
  background: rgba(4, 10, 9, 0.74);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.28s var(--ease), visibility 0s linear 0.28s;
}
.nav-scrim[data-open="true"] {
  opacity: 1;
  visibility: visible;
  transition: opacity 0.28s var(--ease), visibility 0s;
}

.nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 120;
  width: min(86vw, 360px);
  display: flex;
  flex-direction: column;
  padding: 1.1rem 1.2rem 1.6rem;
  background: var(--ink-800);
  border-left: 1px solid var(--line-strong);
  overflow-y: auto;
  transform: translateX(100%);
  visibility: hidden;
  transition: transform 0.28s var(--ease), visibility 0s linear 0.28s;
}
.nav-drawer[data-open="true"] {
  transform: none;
  visibility: visible;
  transition: transform 0.28s var(--ease), visibility 0s;
}

.nav-drawer__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--line);
}
.nav-drawer__close {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  background: transparent;
  border: 1px solid var(--line-strong);
  color: var(--paper);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.nav-drawer__close:hover { color: var(--rose); border-color: var(--rose); }

.nav-drawer__list { list-style: none; margin: 0.4rem 0 0; padding: 0; }
.nav-drawer__link {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--paper);
  text-decoration: none;
  font-size: 1.12rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  transition: color 0.18s var(--ease);
}
.nav-drawer__link::after {
  content: "→";
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
}
.nav-drawer__link:hover { color: var(--cyan); }
.nav-drawer__link[aria-current="page"] { color: var(--cyan); }
.nav-drawer__link[aria-current="page"]::after { color: var(--cyan); }

.nav-drawer__meta {
  margin-top: auto;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 0.7rem;
  justify-items: start;
}
.nav-drawer__note {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 按钮 ---------- */
.btn {
  --btn-bg: transparent;
  --btn-fg: var(--paper);
  --btn-bd: var(--line-strong);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.62rem 1.05rem;
  border: 1px solid var(--btn-bd);
  border-radius: 0;
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease),
    border-color 0.18s var(--ease);
}
.btn:hover { --btn-bg: var(--ink-700); --btn-fg: var(--cyan-soft); --btn-bd: var(--cyan); }
.btn--primary { --btn-bg: var(--cyan); --btn-fg: #04120F; --btn-bd: var(--cyan); }
.btn--primary:hover { --btn-bg: var(--cyan-soft); --btn-fg: #04120F; --btn-bd: var(--cyan-soft); }
.btn--ghost { --btn-bg: transparent; --btn-fg: var(--paper); --btn-bd: var(--line-strong); }
.btn--rose { --btn-bg: transparent; --btn-fg: var(--rose); --btn-bd: rgba(232, 85, 122, 0.55); }
.btn--rose:hover { --btn-bg: var(--rose); --btn-fg: #160409; --btn-bd: var(--rose); }

/* ---------- 面包屑 ---------- */
.breadcrumbs {
  padding-block: 0.85rem;
  border-bottom: 1px solid var(--line);
}
.breadcrumbs__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}
.breadcrumbs__item { display: flex; align-items: center; gap: 0.45rem; }
.breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  color: var(--line-strong);
}
.breadcrumbs__link { color: var(--muted); text-decoration: none; transition: color 0.16s var(--ease); }
.breadcrumbs__link:hover { color: var(--cyan); }
.breadcrumbs__item[aria-current="page"] { color: var(--paper); }

/* ---------- 面板 / 标签 ---------- */
.panel {
  background: var(--ink-800);
  border: 1px solid var(--line);
  padding: clamp(1.1rem, 2.4vw, 1.8rem);
}
.panel--raised { background: var(--ink-700); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.16rem 0.5rem;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.tag--cyan { color: var(--cyan); border-color: rgba(43, 224, 200, 0.42); }
.tag--amber { color: var(--amber); border-color: rgba(242, 179, 61, 0.42); }
.tag--rose { color: var(--rose); border-color: rgba(232, 85, 122, 0.42); }

/* ---------- 图片容器（页面阶段放置图片） ---------- */
.figure { margin: 0; display: grid; gap: 0.65rem; }

.figure__media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background-color: var(--ink-800);
  background-image:
    linear-gradient(135deg, rgba(43, 224, 200, 0.14), rgba(242, 179, 61, 0.06) 46%, transparent 72%),
    repeating-linear-gradient(90deg, var(--grid) 0 1px, transparent 1px 30px);
}
.figure__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}
.figure__media--wide { aspect-ratio: 21 / 9; }
.figure__media--tall { aspect-ratio: 4 / 5; }
.figure__media--square { aspect-ratio: 1 / 1; }

.figure__caption {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1.65;
  letter-spacing: 0.01em;
  color: var(--muted);
}
.figure__caption b,
.figure__caption strong { color: var(--amber); font-weight: 600; }

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: clamp(3rem, 8vw, 7rem);
  background: var(--ink-800);
  border-top: 1px solid var(--line-strong);
  color: var(--paper);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.6fr);
  gap: clamp(1.6rem, 4vw, 3.6rem);
  padding-block: clamp(2.2rem, 5vw, 3.6rem);
}

.footer-brand { display: grid; gap: 0.9rem; align-content: start; }
.brand--footer { gap: 0.3rem; }
.brand--footer .brand__mark { font-size: 1.55rem; }
.brand--footer .brand__sub { font-size: 0.68rem; }

.footer-note {
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--muted);
  max-width: 30ch;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.4rem;
}
.footer-col__title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 0.85rem;
}
.footer-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.55rem; }
.footer-link {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.16s var(--ease);
}
.footer-link::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 1px;
  margin-right: 0.5rem;
  vertical-align: middle;
  background: var(--line-strong);
  transition: background-color 0.16s var(--ease);
}
.footer-link:hover { color: var(--paper); }
.footer-link:hover::before { background: var(--cyan); }

.footer-meta { border-top: 1px solid var(--line); padding-block: 1.4rem; }
.footer-meta__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem clamp(1.2rem, 3vw, 2.6rem);
}
.footer-meta__item {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--muted);
}
.footer-meta__key {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
  flex: none;
}
.footer-meta__val { color: var(--paper); }

.footer-hint {
  margin-top: 0.9rem;
  font-size: 0.76rem;
  line-height: 1.7;
  color: var(--muted);
  max-width: 62ch;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding-block: 1.1rem 1.6rem;
  border-top: 1px solid var(--line);
}
.footer-legal {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.02em;
  color: var(--muted);
}
.footer-legal__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.2rem;
}
.footer-legal__link {
  font-size: 0.76rem;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}
.footer-legal__link:hover { color: var(--cyan); border-bottom-color: var(--cyan); }

/* ---------- 滚动显现 ---------- */
.js .reveal,
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.32s var(--ease), transform 0.32s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
.js .reveal.is-visible,
.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 平板 ---------- */
@media (max-width: 1023px) {
  .site-nav { display: none; }
  .header-cta { display: none; }
  .nav-toggle { display: inline-flex; }

  .site-header__grid { grid-template-columns: 1fr auto; }

  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-4, .span-5, .span-6, .span-7, .span-8 { grid-column: span 6; }
  .span-12 { grid-column: span 6; }

  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-note { max-width: 46ch; }
}

/* ---------- 手机 ---------- */
@media (max-width: 719px) {
  :root { --header-h: 56px; }

  .site-header__grid { min-height: var(--header-h); column-gap: 0.8rem; }
  .brand__mark { font-size: 1.14rem; }
  .brand__sub { font-size: 0.58rem; letter-spacing: 0.05em; }

  .grid--12,
  .grid--2,
  .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .span-4, .span-5, .span-6, .span-7, .span-8, .span-12 { grid-column: auto; }

  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.2rem; }
  .footer-meta__list { flex-direction: column; gap: 0.5rem; }
  .footer-meta__item { flex-wrap: wrap; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }

  .figure__media { aspect-ratio: 4 / 3; }
  .figure__media--wide { aspect-ratio: 16 / 9; }
}

/* ---------- 减弱动效 ---------- */
@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;
    transition-delay: 0ms !important;
  }
  .js .reveal,
  .js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .scroll-progress { transition: none; }
}