/* =========================================================
   BSPORTS指南 · /assets/site.css
   共享壳层：reset / 变量 / 中文排版 / 刊头 / 页脚 / 基础组件
   ========================================================= */

:root{
  --ink:#0B0F0D;
  --deep:#0F2A22;
  --lift:#16382C;
  --slate:#1C2B2E;
  --moss:#3E5C4B;
  --stone:#8A8F8B;
  --paper:#EDE8DC;
  --answer:#4FF0D0;
  --live:#FF7A2F;
  --clay:#A85530;

  --font-display:"Arial Narrow","Helvetica Neue",Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,sans-serif;
  --font-num:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,"Courier New",monospace;

  --wrap:1280px;
  --gutter:20px;
  --rule:2px solid var(--moss);
  --shadow-hard:8px 8px 0 rgba(11,15,13,.55);
  --shadow-soft:4px 4px 0 rgba(11,15,13,.6);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit}
a{color:var(--answer);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:.22em}
main{display:block}
::selection{background:var(--answer);color:var(--ink)}
:focus-visible{outline:2px solid var(--answer);outline-offset:2px}

/* ---------- 中文排版 ---------- */
.display-1{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(2rem,5vw,3.4rem);
  line-height:1.08;
  letter-spacing:.02em;
  text-transform:uppercase;
}
.display-2{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(1.35rem,2.6vw,2rem);
  line-height:1.2;
  letter-spacing:.03em;
}
.eyebrow{
  display:inline-block;
  font-size:12px;
  letter-spacing:.3em;
  color:var(--stone);
  text-transform:uppercase;
}
.num{font-family:var(--font-num);font-variant-numeric:tabular-nums}

/* ---------- 布局容器 ---------- */
.container{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}
.section{padding-block:clamp(40px,7vw,88px)}
.prose{max-width:62ch;font-size:17px;line-height:1.75;color:var(--paper)}
.prose p+p{margin-top:1em}
.prose h2,.prose h3{margin:1.6em 0 .5em;font-size:22px;line-height:1.35}
.prose ul,.prose ol{margin:1em 0;padding-left:1.3em;list-style:disc}
.prose ol{list-style:decimal}
.prose li+li{margin-top:.4em}
.prose strong{color:var(--answer)}
.prose a{border-bottom:1px solid var(--answer)}

.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2vw,28px)}
.grid-2,.grid-3,.grid-4{display:grid;gap:clamp(16px,2vw,28px)}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}

@media (min-width:861px){
  .span-3{grid-column:span 3}
  .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-9{grid-column:span 9}
  .span-10{grid-column:span 10}
  .span-12{grid-column:span 12}
}
@media (max-width:860px){
  .grid{grid-template-columns:repeat(4,minmax(0,1fr))}
  .grid .span-3,.grid .span-4,.grid .span-5,.grid .span-6,
  .grid .span-7,.grid .span-8,.grid .span-9,.grid .span-10{grid-column:span 4}
}
@media (max-width:1024px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:680px){
  .grid-2,.grid-3,.grid-4{grid-template-columns:minmax(0,1fr)}
}

/* ---------- 编号章节 ---------- */
.chapter-num{
  display:inline-block;
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(2.6rem,7vw,4.6rem);
  line-height:.86;
  letter-spacing:.04em;
  color:transparent;
  -webkit-text-stroke:2px var(--stone);
}
@supports not (-webkit-text-stroke:2px #000){
  .chapter-num{color:var(--stone)}
}
.chapter-head{
  display:flex;
  align-items:flex-end;
  gap:16px;
  flex-wrap:wrap;
  border-bottom:var(--rule);
  padding-bottom:14px;
}
.answer-line{
  display:block;
  height:2px;
  width:100%;
  background:var(--answer);
  transform-origin:left center;
}
@media (prefers-reduced-motion:no-preference){
  .answer-line{animation:answer-sweep 420ms var(--ease) both}
}
@keyframes answer-sweep{
  from{transform:scaleX(0)}
  to{transform:scaleX(1)}
}

/* ---------- 卡片 / 标签 / 浮层 ---------- */
.card{
  position:relative;
  background:var(--deep);
  border:var(--rule);
  box-shadow:var(--shadow-hard);
  padding:clamp(16px,2vw,24px);
}
.card[data-state="live"]{border-color:var(--live)}
.card[data-state="archive"]{border-color:var(--clay)}
.card-title{
  font-family:var(--font-display);
  font-size:22px;
  font-weight:700;
  letter-spacing:.03em;
  line-height:1.25;
  color:var(--paper);
  margin-bottom:10px;
}
.tag{
  display:inline-block;
  padding:4px 10px;
  border:1px solid var(--moss);
  color:var(--stone);
  font-size:12px;
  letter-spacing:.18em;
  line-height:1.5;
  white-space:nowrap;
}
.tag-answer{border-color:var(--answer);color:var(--answer)}
.tag-live{border-color:var(--live);color:var(--live)}
.tag-clay{background:var(--clay);border-color:var(--clay);color:var(--paper)}
.overlay-panel{
  background:rgba(22,56,44,.88);
  border:var(--rule);
  border-left:3px solid var(--answer);
  padding:14px 16px;
}

/* ---------- 比分 ---------- */
.score{display:flex;align-items:baseline;gap:12px;font-family:var(--font-num);font-variant-numeric:tabular-nums}
.score-num{
  font-size:clamp(2rem,6vw,3.4rem);
  font-weight:700;
  line-height:1;
  letter-spacing:.02em;
  color:var(--paper);
}
.score-num[data-live="true"]{color:var(--live)}
.score-meta{font-size:14px;color:var(--stone);letter-spacing:.08em}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:12px 20px;
  border:2px solid var(--answer);
  background:var(--answer);
  color:var(--ink);
  font-size:15px;
  font-weight:700;
  letter-spacing:.06em;
  line-height:1.2;
  text-decoration:none;
  box-shadow:var(--shadow-soft);
  transition:transform .18s var(--ease),background-color .18s linear,color .18s linear,box-shadow .18s var(--ease);
}
.btn:hover{text-decoration:none;transform:translate(-2px,-2px);box-shadow:7px 7px 0 rgba(11,15,13,.6)}
.btn-solid{background:var(--answer);color:var(--ink)}
.btn-line{background:transparent;color:var(--answer)}
.btn-line:hover{background:var(--answer);color:var(--ink)}
.btn-ghost{background:transparent;border-color:var(--moss);color:var(--paper);box-shadow:none}
.btn-ghost:hover{transform:none;box-shadow:none;border-color:var(--answer);color:var(--answer)}

/* ---------- 面包屑 ---------- */
.breadcrumb{font-size:12px;letter-spacing:.18em;color:var(--stone)}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:6px 14px;list-style:none;margin:0;padding:0}
.breadcrumb li{display:flex;align-items:center;gap:14px}
.breadcrumb li+li::before{content:"/";color:var(--moss)}
.breadcrumb a{color:var(--stone);text-decoration:none}
.breadcrumb a:hover{color:var(--answer);text-decoration:none}
.breadcrumb [aria-current="page"]{color:var(--paper)}

/* ---------- 图片容器 ---------- */
.media{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16/10;
  border:var(--rule);
  background:var(--lift);
  overflow:hidden;
}
.media img{width:100%;height:100%;object-fit:cover;filter:saturate(.92) contrast(1.06) brightness(.92)}
.media-wide{aspect-ratio:21/9}
.media-tall{aspect-ratio:4/5}
.media-square{aspect-ratio:1/1}
.media-caption{margin-top:10px;font-size:12px;letter-spacing:.2em;color:var(--stone)}

.scanlines{position:relative}
.scanlines::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:repeating-linear-gradient(0deg,rgba(237,232,220,.035) 0 1px,transparent 1px 4px);
}

/* ---------- 跳至正文 ---------- */
.skip-link{
  position:absolute;
  top:-120px;
  left:16px;
  z-index:200;
  background:var(--answer);
  color:var(--ink);
  border:2px solid var(--ink);
  padding:10px 16px;
  font-size:14px;
  font-weight:700;
  letter-spacing:.08em;
  text-decoration:none;
}
.skip-link:focus{top:14px;text-decoration:none}

/* =========================================================
   刊头
   ========================================================= */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:var(--ink);
  border-bottom:var(--rule);
  color:var(--paper);
}
.header-inner{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}

.header-rail{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:9px 0;
  border-bottom:1px solid var(--slate);
}
.rail-note{
  font-size:12px;
  letter-spacing:.3em;
  color:var(--stone);
  white-space:nowrap;
}
.rail-actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap}

.cta{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:7px 14px;
  border:2px solid var(--answer);
  font-size:13px;
  font-weight:700;
  letter-spacing:.08em;
  line-height:1.2;
  text-decoration:none;
  transition:background-color .18s linear,color .18s linear,border-color .18s linear;
}
.cta:hover{text-decoration:none}
.cta-solid{background:var(--answer);color:var(--ink)}
.cta-solid:hover{background:var(--paper);border-color:var(--paper);color:var(--ink)}
.cta-line{background:transparent;color:var(--answer)}
.cta-line:hover{background:var(--answer);color:var(--ink)}

.masthead{
  position:relative;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:20px 0 16px;
}
.masthead-aside{
  position:absolute;
  left:0;
  top:50%;
  transform:translateY(-50%);
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.28em;
  color:var(--stone);
  white-space:nowrap;
}
.masthead-tools{
  position:absolute;
  right:0;
  top:50%;
  transform:translateY(-50%);
}
.brand{display:block;text-align:center;color:var(--paper);text-decoration:none}
.brand:hover{text-decoration:none}
.brand-name{
  display:block;
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(1.5rem,4.4vw,2.6rem);
  line-height:1;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--paper);
}
.brand-tagline{
  display:block;
  margin-top:9px;
  font-size:12px;
  letter-spacing:.3em;
  color:var(--stone);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:8px 12px;
  background:var(--lift);
  color:var(--paper);
  border:2px solid var(--moss);
  font-size:13px;
  letter-spacing:.12em;
  cursor:pointer;
}
.nav-toggle:hover{border-color:var(--answer);color:var(--answer)}
.nav-toggle[aria-expanded="true"]{background:var(--answer);border-color:var(--answer);color:var(--ink)}
.nav-toggle-bars{position:relative;display:block;width:16px;height:2px;background:currentColor}
.nav-toggle-bars::before,
.nav-toggle-bars::after{content:"";position:absolute;left:0;width:16px;height:2px;background:currentColor}
.nav-toggle-bars::before{top:-5px}
.nav-toggle-bars::after{top:5px}
.nav-toggle-text{line-height:1}

.site-nav{display:block;border-top:1px solid var(--slate)}
.nav-list{display:flex;flex-wrap:wrap;justify-content:center}
.nav-item{display:flex}
.nav-link{
  position:relative;
  display:block;
  padding:13px 20px;
  font-size:14px;
  letter-spacing:.12em;
  color:var(--paper);
  text-decoration:none;
  border-left:1px solid var(--slate);
  transition:color .16s linear,background-color .16s linear;
}
.nav-item:last-child .nav-link{border-right:1px solid var(--slate)}
.nav-link:hover{color:var(--answer);background:var(--lift);text-decoration:none}
.nav-link[aria-current="page"]{color:var(--answer);background:var(--lift)}
.nav-link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:18px;
  right:18px;
  bottom:5px;
  height:2px;
  background:var(--answer);
}

.header-progress{
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  height:2px;
  background:var(--answer);
  transform:scaleX(0);
  transform-origin:0 50%;
}

/* 滚动后收成细条 */
.site-header[data-scrolled="true"] .header-rail{display:none}
.site-header[data-scrolled="true"] .brand-tagline{display:none}
.site-header[data-scrolled="true"] .masthead{padding:11px 0 9px}
.site-header[data-scrolled="true"] .brand-name{font-size:clamp(1.05rem,2.4vw,1.45rem);letter-spacing:.14em}
.site-header[data-scrolled="true"] .nav-link{padding:9px 18px;font-size:13px}

@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .masthead-aside{display:none}
  .masthead{padding:14px 0 12px}
  .site-nav{
    display:grid;
    grid-template-rows:0fr;
    border-top:1px solid var(--moss);
    transition:grid-template-rows 240ms var(--ease);
  }
  .site-nav[data-open],
  .site-nav[data-open="true"]{grid-template-rows:1fr}
  .nav-list{min-height:0;overflow:hidden;flex-direction:column;justify-content:flex-start}
  .nav-item{display:block}
  .nav-link{
    border-left:0;
    border-bottom:1px solid var(--slate);
    padding:15px 4px;
    font-size:15px;
  }
  .nav-item:last-child .nav-link{border-right:0}
  .nav-link[aria-current="page"]::after{left:4px;right:auto;width:34px;bottom:9px}
}
@media (max-width:560px){
  .rail-note{display:none}
  .rail-actions{width:100%;justify-content:space-between}
  .brand-name{letter-spacing:.12em}
  .brand-tagline{letter-spacing:.2em}
}

/* =========================================================
   页脚
   ========================================================= */
.site-footer{
  position:relative;
  overflow:hidden;
  background:var(--deep);
  border-top:var(--rule);
  color:var(--paper);
}
.footer-mark{
  position:absolute;
  right:-2vw;
  bottom:-.18em;
  z-index:0;
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(5rem,20vw,14rem);
  line-height:.8;
  letter-spacing:.04em;
  color:var(--lift);
  pointer-events:none;
  user-select:none;
}
.footer-inner{
  position:relative;
  z-index:1;
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:clamp(40px,6vw,72px) var(--gutter) 0;
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,2fr);
  gap:clamp(24px,4vw,56px);
}
.footer-answer{width:clamp(90px,22vw,200px);margin-bottom:20px}
.footer-brand-name{
  font-family:var(--font-display);
  font-weight:700;
  font-size:26px;
  line-height:1.1;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--paper);
}
.footer-tagline{
  margin-top:10px;
  font-size:12px;
  letter-spacing:.3em;
  color:var(--answer);
}
.footer-note{
  margin-top:16px;
  max-width:34ch;
  font-size:14px;
  line-height:1.85;
  color:var(--stone);
}
.footer-columns{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(18px,2.4vw,32px);
}
.footer-col{display:flex;flex-direction:column;align-items:flex-start}
.footer-col-title{
  display:block;
  width:100%;
  padding-bottom:9px;
  margin-bottom:12px;
  border-bottom:1px solid var(--moss);
  font-family:var(--font-display);
  font-size:15px;
  font-weight:700;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--paper);
  text-decoration:none;
}
.footer-col-title:hover{color:var(--answer);text-decoration:none;border-color:var(--answer)}
.footer-col-line{
  font-size:13px;
  line-height:2;
  letter-spacing:.08em;
  color:var(--stone);
}
.footer-col-link{
  font-size:13px;
  line-height:2;
  letter-spacing:.08em;
  color:var(--paper);
  border-bottom:1px solid transparent;
}
.footer-col-link:hover{color:var(--answer);border-color:var(--answer);text-decoration:none}

.footer-contact{
  position:relative;
  z-index:1;
  width:100%;
  max-width:var(--wrap);
  margin:clamp(28px,4vw,48px) auto 0;
  padding:18px var(--gutter);
  display:flex;
  flex-wrap:wrap;
  gap:8px 32px;
  border-top:1px solid var(--moss);
  border-bottom:1px solid var(--moss);
}
.footer-contact-item{
  font-family:var(--font-num);
  font-size:13px;
  letter-spacing:.03em;
  color:var(--paper);
}
.footer-contact-label{
  margin-right:10px;
  font-family:var(--font-body);
  font-size:12px;
  letter-spacing:.24em;
  color:var(--stone);
}
.footer-service{
  position:relative;
  z-index:1;
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:16px var(--gutter) 0;
  font-size:13px;
  line-height:1.8;
  letter-spacing:.06em;
  color:var(--stone);
}
.footer-legal{
  position:relative;
  z-index:1;
  width:100%;
  max-width:var(--wrap);
  margin:18px auto 0;
  padding:18px var(--gutter) 30px;
  border-top:1px solid var(--moss);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 28px;
}
.legal-links{display:flex;flex-wrap:wrap;gap:10px 22px}
.legal-links a{
  font-size:12px;
  letter-spacing:.18em;
  color:var(--stone);
  border-bottom:1px solid transparent;
}
.legal-links a:hover{color:var(--answer);border-color:var(--answer);text-decoration:none}
.legal-note{
  font-family:var(--font-num);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--stone);
}

@media (max-width:900px){
  .footer-inner{grid-template-columns:minmax(0,1fr)}
  .footer-columns{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-note{max-width:none}
}
@media (max-width:520px){
  .footer-columns{grid-template-columns:minmax(0,1fr)}
  .footer-legal{flex-direction:column;align-items:flex-start}
}

/* =========================================================
   动效 · 显现
   ========================================================= */
.js-ready [data-reveal]{
  opacity:0;
  transform:translateY(16px);
}
.js-ready [data-reveal].is-visible{
  opacity:1;
  transform:none;
}
@media (prefers-reduced-motion:no-preference){
  .js-ready [data-reveal]{
    transition:opacity .42s var(--ease),transform .42s var(--ease);
  }
  .js-ready [data-reveal].is-visible{
    transition:opacity .42s var(--ease),transform .42s var(--ease);
    transition-delay:var(--reveal-delay,0ms);
  }
  html{scroll-behavior:smooth}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js-ready [data-reveal]{opacity:1;transform:none}
  .header-progress{display:none}
}