/* =========================================================
   58买球品牌 · 共享样式 /assets/site.css
   结构：reset → 变量 → 中文排版 → 外壳 → 组件 → 响应式
   ========================================================= */

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body, h1, h2, h3, h4, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
img, svg, video, canvas { display: block; max-width: 100%; height: auto; }
[hidden] { display: none !important; }

/* ---------- 变量 ---------- */
:root {
  --ink-900: #08131F;
  --ink-800: #0E1F30;
  --panel-700: #16324A;
  --cyan: #38E1FF;
  --orange: #FF6A2B;
  --lime: #A8F04B;
  --paper: #F2F6FA;
  --mist: #9FB1C1;
  --line: #24405A;
  --void: #04121A;

  --strip-h: 40px;
  --rail-w: clamp(168px, 15vw, 224px);
  --quick-h: 52px;
  --gutter: clamp(16px, 3vw, 40px);

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

  --ease: cubic-bezier(.22, .61, .36, 1);

  --z-quick: 65;
  --z-rail: 60;
  --z-strip: 70;
  --z-top: 95;
  --z-skip: 100;
}

/* ---------- 中文排版与基础 ---------- */
body {
  min-height: 100vh;
  background: var(--ink-900);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  padding-top: var(--strip-h);
  padding-left: var(--rail-w);
  padding-bottom: calc(var(--quick-h) + 12px);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -.02em;
  text-wrap: balance;
}
h1 { font-size: clamp(2.4rem, 5.6vw, 5.4rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.6rem); }
h3 { font-size: clamp(1.2rem, 1.8vw, 1.5rem); line-height: 1.3; }

p { max-width: 36em; line-height: 1.75; }
p + p { margin-top: 1.4em; }

code, kbd, samp, .mono { font-family: var(--font-mono); letter-spacing: .04em; }

::selection { background: var(--cyan); color: var(--ink-900); }

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

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-skip);
  padding: .65rem 1.2rem;
  background: var(--cyan);
  color: var(--ink-900);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .02em;
  border-radius: 2px;
  transition: top .18s var(--ease);
}
.skip-link:focus { top: 8px; }

/* ---------- 头部外壳 ---------- */
.site-header { position: relative; z-index: var(--z-strip); }

/* 状态条 */
.status-strip {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--strip-h);
  z-index: var(--z-strip);
  background: var(--void);
  border-bottom: 1px solid var(--line);
}
.status-strip-inner {
  display: flex;
  align-items: center;
  gap: .5rem;
  height: 100%;
  padding: 0 var(--gutter);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.status-strip-inner::-webkit-scrollbar { display: none; }

.status-chip {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  white-space: nowrap;
  padding: 3px 9px;
  border: 1px solid var(--line);
  border-radius: 2px;
  line-height: 1.3;
}
.status-chip--live { color: var(--lime); border-color: rgba(168, 240, 75, .38); }
.status-chip--new { color: var(--orange); border-color: rgba(255, 106, 43, .42); }

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lime);
  animation: statusPulse 2.4s var(--ease) infinite;
}
@keyframes statusPulse {
  0% { box-shadow: 0 0 0 0 rgba(168, 240, 75, .55); }
  70% { box-shadow: 0 0 0 7px rgba(168, 240, 75, 0); }
  100% { box-shadow: 0 0 0 0 rgba(168, 240, 75, 0); }
}

.status-meta {
  margin-left: auto;
  white-space: nowrap;
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
}

/* 左侧导航轨道 */
.rail {
  position: fixed;
  top: var(--strip-h);
  left: 0;
  bottom: var(--quick-h);
  width: var(--rail-w);
  z-index: var(--z-rail);
  display: flex;
  flex-direction: column;
  padding: 20px 16px 16px;
  background: var(--ink-800);
  border-right: 1px solid var(--line);
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
}
.rail::after {
  content: "";
  position: absolute;
  top: 0;
  right: -1px;
  width: 1px;
  height: 96px;
  background: linear-gradient(180deg, var(--cyan), rgba(56, 225, 255, 0));
}

.rail-top { display: block; }

.brand {
  display: block;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}
.brand-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .3em;
  color: var(--cyan);
}
.brand-word {
  display: block;
  margin-top: 2px;
  font-size: clamp(24px, 2.4vw, 30px);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.1;
  color: var(--paper);
  transition: color .18s var(--ease);
}
.brand:hover .brand-word { color: var(--cyan); }
.brand-tag {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--mist);
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(56, 225, 255, .06);
  color: var(--paper);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .04em;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}
.nav-toggle:hover { color: var(--cyan); border-color: var(--cyan); }
.nav-toggle-bars { position: relative; width: 16px; height: 10px; display: block; }
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: currentColor;
  transition: transform .2s var(--ease), top .2s var(--ease), bottom .2s var(--ease);
}
.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 4px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { bottom: 4px; transform: rotate(-45deg); }

/* 导航 */
.site-nav {
  display: flex;
  flex-direction: column;
  flex: 1;
  margin-top: 20px;
  min-height: 0;
}
.nav-list { display: flex; flex-direction: column; gap: 2px; }
.nav-item { display: block; }
.nav-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 16px 10px 12px;
  border-left: 2px solid transparent;
  color: var(--paper);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .01em;
  transition: color .18s var(--ease), background .18s var(--ease),
    border-color .18s var(--ease);
}
.nav-num {
  min-width: 20px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--mist);
  transition: color .18s var(--ease);
}
.nav-text { display: inline-block; }
.nav-link:hover,
.nav-link:focus-visible {
  background: rgba(56, 225, 255, .07);
  border-left-color: var(--cyan);
  color: var(--cyan);
}
.nav-link:hover .nav-num { color: var(--cyan); }
.nav-link[aria-current="page"] {
  background: var(--panel-700);
  border-left-color: var(--cyan);
  color: var(--cyan);
  font-weight: 800;
}
.nav-link[aria-current="page"] .nav-num { color: var(--cyan); }

.nav-note {
  margin-top: auto;
  padding-top: 14px;
  font-family: var(--font-mono);
  font-size: 10px;
  line-height: 1.7;
  letter-spacing: .16em;
  color: rgba(159, 177, 193, .55);
}

.rail-foot {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.rail-ver {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--mist);
}

.rail-annotation {
  display: none;
  position: absolute;
  right: 5px;
  top: calc(50% - 96px);
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .34em;
  color: rgba(159, 177, 193, .34);
  pointer-events: none;
}
@media (min-width: 1280px) { .rail-annotation { display: block; } }

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .72rem 1.15rem;
  border: 1px solid var(--cyan);
  border-radius: 2px;
  background: var(--cyan);
  color: var(--ink-900);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .02em;
  line-height: 1.3;
  transition: background .18s var(--ease), color .18s var(--ease),
    border-color .18s var(--ease), transform .18s var(--ease);
}
.btn:hover { background: var(--paper); border-color: var(--paper); }
.btn:active { transform: translateY(1px); }

.btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: var(--line);
}
.btn--ghost:hover {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
}
.btn--sm { padding: .5rem .8rem; font-size: 12px; letter-spacing: .04em; }
.btn--block { width: 100%; }

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: clamp(48px, 8vw, 96px);
  background: var(--void);
  border-top: 1px solid var(--line);
}
.footer-inner {
  width: 100%;
  max-width: 1320px;
  margin-inline: auto;
  padding: clamp(32px, 5vw, 64px) var(--gutter) clamp(28px, 4vw, 48px);
}
.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.6fr);
  gap: clamp(28px, 4vw, 64px);
}
.footer-mark {
  display: block;
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1;
  color: var(--paper);
}
.footer-tag {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
  max-width: 28em;
}

.stat-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}
.stat-chip {
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 10px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: 2px;
}
.stat-num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--cyan);
}
.stat-label {
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--mist);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}
.footer-col-title {
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--paper);
}
.footer-list { display: flex; flex-direction: column; gap: 4px; }
.footer-link {
  position: relative;
  display: inline-block;
  padding-block: 4px;
  font-size: 14px;
  color: var(--mist);
  transition: color .16s var(--ease);
}
.footer-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform .2s var(--ease);
}
.footer-link:hover { color: var(--paper); }
.footer-link:hover::after { transform: scaleX(1); }
.footer-link--static {
  display: inline-block;
  padding-block: 4px;
  font-size: 13px;
  font-family: var(--font-mono);
  letter-spacing: .02em;
  color: var(--mist);
}

.footer-contact {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 32px);
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: clamp(20px, 3vw, 32px);
  border-top: 1px solid var(--line);
}
.contact-item { display: flex; flex-direction: column; gap: 6px; }
.contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--mist);
}
.contact-value {
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin-top: clamp(20px, 3vw, 32px);
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}
.footer-legal-sep { color: var(--line); }

/* ---------- 底部固定快捷条 ---------- */
.quick-bar {
  position: fixed;
  left: var(--rail-w);
  right: 0;
  bottom: 0;
  height: var(--quick-h);
  z-index: var(--z-quick);
  display: flex;
  align-items: center;
  gap: clamp(6px, 2vw, 22px);
  padding: 0 var(--gutter);
  background: rgba(4, 18, 26, .96);
  border-top: 1px solid var(--line);
  backdrop-filter: blur(6px);
}
.quick-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--mist);
  white-space: nowrap;
}
.quick-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: 13px;
  font-weight: 700;
  color: var(--paper);
  white-space: nowrap;
  transition: color .16s var(--ease), border-color .16s var(--ease),
    background .16s var(--ease);
}
.quick-link:hover {
  color: var(--cyan);
  border-color: var(--line);
  background: rgba(56, 225, 255, .07);
}
.quick-link--alert { color: var(--orange); }
.quick-dot {
  width: 6px;
  height: 6px;
  background: var(--orange);
  display: inline-block;
}

/* ---------- 内容容器与网格 ---------- */
.container {
  width: 100%;
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { padding-block: clamp(32px, 5vw, 72px); }
.section--alt {
  background: var(--ink-800);
  border-block: 1px solid var(--line);
}
.grid { display: grid; gap: clamp(16px, 2.4vw, 32px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* ---------- 基础组件 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  padding-block: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}
.breadcrumb li { display: flex; align-items: center; gap: .5rem; }
.breadcrumb li + li::before { content: "/"; color: var(--line); }
.breadcrumb a { transition: color .16s var(--ease); }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb [aria-current="page"] { color: var(--paper); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  display: block;
  width: 28px;
  height: 2px;
  background: var(--cyan);
}

.mono-tag {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--mist);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: 2px 8px;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--ink-900);
}
.status-pill--new { background: var(--orange); color: #1A0A02; }
.status-pill--live { background: var(--lime); color: var(--ink-900); }

.panel {
  background: var(--panel-700);
  border: 1px solid var(--line);
  padding: clamp(18px, 2.4vw, 28px);
}
.cut {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px),
    calc(100% - 22px) 100%, 0 100%);
}

.divider {
  height: 1px;
  border: 0;
  background: var(--line);
  margin-block: clamp(20px, 3vw, 36px);
}

.link-underline {
  position: relative;
  display: inline-block;
  color: var(--cyan);
}
.link-underline::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1px;
  background: currentColor;
  transform: scaleX(1);
  transform-origin: 0 50%;
  transition: transform .2s var(--ease);
}
.link-underline:hover::after { transform: scaleX(0); }

/* 图片容器：页面阶段直接放 <img> */
.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--ink-800);
  border: 1px solid var(--line);
  aspect-ratio: 16 / 9;
  width: 100%;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.media-caption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .03em;
  color: var(--mist);
}

.vertical-note {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .32em;
  color: var(--mist);
}

/* ---------- 滚动进度（JS 创建） ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--lime));
  transform: scaleX(0);
  transform-origin: 0 50%;
  z-index: var(--z-top);
  pointer-events: none;
}

/* ---------- 滚动显现协议 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 平板与手机 ---------- */
@media (max-width: 1023px) {
  :root { --rail-w: 0px; }
  body { padding-top: 0; padding-left: 0; }

  .site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-strip);
    background: var(--ink-800);
    border-bottom: 1px solid var(--line);
  }

  .status-strip {
    position: static;
    height: auto;
    border-bottom: 1px solid var(--line);
    background: var(--void);
  }
  .status-strip-inner {
    height: auto;
    padding: 7px var(--gutter);
    font-size: 11px;
    gap: .35rem;
  }
  .status-meta { display: none; }

  .rail {
    position: static;
    width: 100%;
    bottom: auto;
    padding: 10px var(--gutter) 12px;
    border-right: 0;
    overflow: visible;
  }
  .rail::after { display: none; }
  .rail-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
  }

  .brand {
    display: flex;
    align-items: baseline;
    gap: 8px;
    padding-bottom: 0;
    border-bottom: 0;
  }
  .brand-index { font-size: 11px; letter-spacing: .2em; }
  .brand-word { margin-top: 0; font-size: 22px; }
  .brand-tag { display: none; }

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

  .site-nav {
    display: none;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--line);
    max-height: 66vh;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  .site-nav[data-open="true"] { display: block; }

  .nav-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px;
  }
  .nav-link { padding: 9px 10px; font-size: 14px; }
  .nav-note { margin-top: 12px; padding-top: 0; }

  .rail-foot {
    margin-top: 14px;
    padding-top: 12px;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
  }
  .rail-foot .btn--block { width: auto; }

  .quick-bar { left: 0; }

  .grid--2, .grid--3 { grid-template-columns: minmax(0, 1fr); }

  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  .footer-contact { grid-template-columns: minmax(0, 1fr); }
  .footer-legal { font-size: 11px; }
  .quick-label { display: none; }
}

@media (max-width: 520px) {
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
  .status-chip:nth-child(3) { display: none; }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  .status-dot { animation: none; }
  [data-reveal] { opacity: 1; transform: none; }
  .scroll-progress { transition: none; }
}