/* ============================================================
   必一BSPORTS · 品牌认证 V3.1 中文站
   共享样式表 /assets/site.css
   炭黑驾驶舱底 · 炽焰橙红行动 · 电光青数据状态 · 暖纸白正文
   ============================================================ */

/* ---------- 1. 基础重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,dl,dd,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* ---------- 2. 设计变量 ---------- */
:root{
  --ink:#111417;
  --teal-black:#0B1F24;
  --wine-black:#241018;
  --indigo-black:#1A1533;
  --flame:#FF4D1A;
  --cyan:#00E5FF;
  --paper:#F4F1EA;
  --steel:#8A9399;
  --panel:#2C3238;
  --ember:#FFB08A;

  --line:rgba(244,241,234,.13);
  --line-strong:rgba(244,241,234,.26);
  --line-soft:rgba(244,241,234,.07);

  --font-display:"Barlow Condensed","DIN Alternate","Noto Sans SC",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",Consolas,monospace;

  --wrap:1280px;
  --gutter:clamp(1.1rem,4vw,3rem);
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-lift:0 18px 44px -20px rgba(0,0,0,.9);
  --cut:14px;
}

/* ---------- 3. 基础排版 ---------- */
body{
  min-height:100vh;
  background-color:var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.68;
  -webkit-font-smoothing:antialiased;
  background-image:
    radial-gradient(rgba(244,241,234,.055) .6px, transparent .6px),
    radial-gradient(rgba(0,229,255,.045) .6px, transparent .6px);
  background-size:4px 4px, 9px 9px;
  background-position:0 0, 2px 3px;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:600;line-height:1.1;letter-spacing:.01em;color:var(--paper)}
h1{font-size:clamp(2.3rem,6vw,4.4rem);font-weight:300}
h2{font-size:clamp(1.85rem,4vw,2.8rem)}
h3{font-size:clamp(1.2rem,2.4vw,1.55rem)}
h4{font-size:clamp(1rem,1.8vw,1.15rem);font-weight:600}
strong{color:var(--ember);font-weight:600}
em{font-style:italic;color:var(--flame)}
::selection{background:var(--flame);color:#0b0e10}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:1px}

/* ---------- 4. 布局容器 ---------- */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}

.section{padding-block:clamp(3rem,7vw,5.5rem)}
.section--tight{padding-block:clamp(1.8rem,4vw,3rem)}
.rule{height:1px;border:0;background:var(--line);margin-block:clamp(1.6rem,4vw,2.6rem)}

/* ---------- 5. 章节索引 ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:.55rem;
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.26em;
  text-transform:uppercase;color:var(--cyan);
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--cyan);opacity:.85}

.section__head{display:grid;gap:.7rem;align-content:start}
.section__index{
  font-family:var(--font-display);
  font-size:clamp(2.6rem,6.5vw,4.6rem);
  font-weight:200;line-height:.88;letter-spacing:.02em;
  color:rgba(244,241,234,.22);
}
@supports (-webkit-text-stroke:1px red){
  .section__index{color:transparent;-webkit-text-stroke:1px rgba(244,241,234,.34)}
}
.section__title{font-size:clamp(1.85rem,4vw,2.8rem);line-height:1.08}
.section__lead{color:var(--steel);max-width:60ch;font-size:1rem;line-height:1.75}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55rem;
  padding:.85rem 1.55rem;
  font-family:var(--font-body);font-size:.88rem;font-weight:700;letter-spacing:.08em;
  line-height:1;cursor:pointer;
  clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut));
  transition:background .2s var(--ease),color .2s var(--ease),box-shadow .2s var(--ease);
}
.btn--flame{background:var(--flame);color:#0c0f11}
.btn--flame:hover{background:#ff6a3d;box-shadow:inset 0 0 0 2px var(--ember)}
.btn--ghost{background:rgba(244,241,234,.04);color:var(--paper);box-shadow:inset 0 0 0 1px var(--line-strong)}
.btn--ghost:hover{background:rgba(0,229,255,.1);color:var(--cyan);box-shadow:inset 0 0 0 1px var(--cyan)}
.btn--cyan{background:var(--cyan);color:#062a30}
.btn--cyan:hover{background:#5cf0ff}
.btn:focus-visible{outline:none;box-shadow:inset 0 0 0 3px var(--cyan),0 0 0 2px rgba(17,20,23,.9)}
.btn:active{transform:translateY(1px)}

/* ---------- 7. 标签与状态 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:.4rem;
  font-family:var(--font-mono);font-size:.64rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--ember);border:1px solid rgba(255,176,138,.42);
  padding:.3rem .62rem;
  clip-path:polygon(6px 0,100% 0,100% calc(100% - 6px),calc(100% - 6px) 100%,0 100%,0 6px);
}
.tag--cyan{color:var(--cyan);border-color:rgba(0,229,255,.42)}
.tag--flame{color:#ffd2c1;border-color:rgba(255,77,26,.62);background:rgba(255,77,26,.14)}
.status-dot{
  display:inline-block;width:7px;height:7px;border-radius:50%;
  background:var(--cyan);box-shadow:0 0 0 3px rgba(0,229,255,.16);
  flex:0 0 auto;
}
.numeral{
  font-family:var(--font-mono);font-weight:600;
  font-variant-numeric:tabular-nums;letter-spacing:-.02em;line-height:.86;
}
.mono{font-family:var(--font-mono);letter-spacing:.08em;font-variant-numeric:tabular-nums}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb{
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--steel);
}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem}
.breadcrumb li{display:flex;align-items:center;gap:.45rem}
.breadcrumb li::after{content:"/";color:rgba(138,147,153,.45)}
.breadcrumb li:last-child::after{content:""}
.breadcrumb a{color:var(--steel);transition:color .18s var(--ease)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--paper)}

/* ---------- 9. 内容板件 ---------- */
.cut-card{
  position:relative;
  padding:clamp(1.2rem,2.6vw,2rem);
  background:linear-gradient(152deg,rgba(44,50,56,.94),rgba(17,20,23,.94));
  box-shadow:inset 0 0 0 1px var(--line);
  clip-path:polygon(0 0,calc(100% - 22px) 0,100% 22px,100% 100%,22px 100%,0 calc(100% - 22px));
}
.cut-card > * + *{margin-top:.8rem}

.panel{
  padding:clamp(1.1rem,2.4vw,1.8rem);
  background:var(--panel);
  box-shadow:inset 0 0 0 1px var(--line);
}
.panel > * + *{margin-top:.8rem}

.paper{
  position:relative;
  padding:clamp(1.4rem,3vw,2.4rem);
  background:var(--paper);
  color:#14181b;
  box-shadow:8px 8px 0 rgba(255,77,26,.18),16px 16px 0 rgba(0,229,255,.1);
}
.paper h2,.paper h3,.paper h4{color:#14181b}
.paper .eyebrow{color:#b8300d}
.paper .eyebrow::before{background:#b8300d}
.paper > * + *{margin-top:.9rem}

/* ---------- 10. 图片容器基础规则 ---------- */
.media-frame{
  position:relative;display:block;width:100%;overflow:hidden;
  aspect-ratio:16/9;
  background:
    radial-gradient(120% 90% at 20% 0%,rgba(255,77,26,.22),transparent 60%),
    linear-gradient(145deg,var(--teal-black) 0%,var(--indigo-black) 58%,var(--wine-black) 100%);
  box-shadow:inset 0 0 0 1px var(--line);
}
.media-frame img{width:100%;height:100%;object-fit:cover;display:block}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(17,20,23,0) 42%,rgba(17,20,23,.78) 100%);
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame__caption{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:.85rem 1.1rem;
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--paper);
}

/* ---------- 11. 基础表格 ---------- */
.data-table{font-family:var(--font-mono);font-size:.82rem;color:var(--paper)}
.data-table caption{
  caption-side:top;text-align:left;padding-bottom:.7rem;
  font-size:.68rem;letter-spacing:.2em;text-transform:uppercase;color:var(--steel);
}
.data-table th,.data-table td{
  padding:.62rem .7rem;text-align:left;vertical-align:middle;
  border-bottom:1px solid var(--line-soft);
}
.data-table thead th{
  font-size:.64rem;font-weight:500;letter-spacing:.16em;text-transform:uppercase;
  color:var(--steel);border-bottom:1px solid var(--line);
}
.data-table tbody tr:hover{background:rgba(0,229,255,.06)}
.data-table td.is-num{font-variant-numeric:tabular-nums;color:var(--ember)}

/* ---------- 12. 头部：居中刊头导航 ---------- */
.skip-link{
  position:absolute;left:1rem;top:-120px;z-index:300;
  padding:.72rem 1.1rem;background:var(--cyan);color:#05232a;
  font-family:var(--font-mono);font-size:.78rem;font-weight:700;letter-spacing:.08em;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:.7rem}

.site-header{
  position:sticky;top:0;z-index:80;
  background:linear-gradient(180deg,#161a1e 0%,#0d1e23 100%);
  border-bottom:1px solid var(--line);
  box-shadow:0 12px 34px -24px rgba(0,0,0,.95);
}

.scroll-meter{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:rgba(244,241,234,.08);overflow:hidden;
}
.scroll-meter__fill{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--flame) 0%,var(--ember) 45%,var(--cyan) 100%);
  transition:transform .1s linear;
}

.masthead{
  display:grid;grid-template-columns:1fr auto 1fr;
  align-items:center;gap:1rem;
  max-width:var(--wrap);margin-inline:auto;
  padding:.9rem var(--gutter) .55rem;
}
.masthead__edition{
  display:inline-flex;align-items:center;gap:.5rem;justify-self:start;
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.22em;
  text-transform:uppercase;color:var(--steel);
}
.masthead__edition-dot{
  width:7px;height:7px;border-radius:50%;background:var(--cyan);
  box-shadow:0 0 0 3px rgba(0,229,255,.16);
}
.masthead__brand{
  display:grid;justify-items:center;gap:.18rem;justify-self:center;
  padding:.15rem .5rem;
}
.masthead__wordmark{
  display:flex;align-items:baseline;gap:.32rem;
  font-family:var(--font-display);
  font-size:clamp(1.45rem,3.2vw,2.1rem);
  line-height:1;letter-spacing:.05em;
}
.masthead__wordmark-cn{font-weight:300;color:var(--paper)}
.masthead__wordmark-mark{
  display:inline-block;font-weight:700;font-style:italic;
  letter-spacing:-.01em;color:var(--flame);
  transform:skewX(-7deg);transform-origin:bottom left;
}
.masthead__tagline{
  font-family:var(--font-mono);font-size:.58rem;letter-spacing:.34em;
  text-transform:uppercase;color:var(--steel);
}
.masthead__tools{display:flex;align-items:center;gap:.7rem;justify-self:end}

.masthead__tool{
  font-size:.82rem;letter-spacing:.06em;color:var(--steel);
  padding:.42rem .1rem;border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.masthead__tool:hover{color:var(--paper);border-bottom-color:var(--cyan)}
.masthead__tool--cta{
  color:#0c0f11;background:var(--flame);border-bottom:0;
  padding:.52rem 1rem;font-weight:700;font-size:.78rem;letter-spacing:.1em;
  clip-path:polygon(9px 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%,0 9px);
  transition:background .18s var(--ease),color .18s var(--ease);
}
.masthead__tool--cta:hover{background:var(--ember);color:#0c0f11;border-bottom-color:transparent}

.nav-toggle{
  display:none;align-items:center;gap:.5rem;cursor:pointer;
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--paper);padding:.52rem .72rem;
  box-shadow:inset 0 0 0 1px var(--line-strong);
  clip-path:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);
}
.nav-toggle:hover{color:var(--cyan)}
.nav-toggle__bars{display:grid;gap:3px;width:16px}
.nav-toggle__bars span{
  display:block;height:2px;background:currentColor;
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle__label{line-height:1}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

.primary-nav{
  border-top:1px solid var(--line-soft);
  background:rgba(11,31,36,.5);
}
.primary-nav__list{
  display:flex;justify-content:center;flex-wrap:wrap;
  max-width:var(--wrap);margin-inline:auto;
  padding:0 var(--gutter);
}
.primary-nav__link{
  position:relative;display:flex;align-items:baseline;gap:.45rem;
  padding:.72rem .95rem;font-size:.86rem;letter-spacing:.04em;
  color:rgba(244,241,234,.72);
  transition:color .18s var(--ease),background .18s var(--ease);
}
.primary-nav__num{
  font-family:var(--font-mono);font-size:.6rem;letter-spacing:.1em;
  color:var(--steel);transition:color .18s var(--ease);
}
.primary-nav__text{display:inline}
.primary-nav__link:hover{color:var(--paper);background:rgba(255,77,26,.1)}
.primary-nav__link:hover .primary-nav__num{color:var(--flame)}
.primary-nav__link[aria-current="page"]{color:var(--paper)}
.primary-nav__link[aria-current="page"] .primary-nav__num{color:var(--cyan)}
.primary-nav__link[aria-current="page"]::after{
  content:"";position:absolute;left:.95rem;right:.95rem;bottom:.22rem;height:2px;
  background:linear-gradient(90deg,var(--flame),var(--cyan));
}

/* ---------- 13. 悬浮快捷胶囊 ---------- */
.quick-bar{
  position:fixed;right:1rem;top:50%;
  transform:translateY(-50%);
  z-index:70;display:flex;flex-direction:column;gap:.45rem;
}
.quick-bar__link{
  display:flex;align-items:center;gap:.45rem;
  padding:.58rem .88rem;font-size:.74rem;letter-spacing:.08em;
  color:var(--paper);background:rgba(44,50,56,.94);
  box-shadow:inset 0 0 0 1px var(--line-strong),0 12px 26px -14px rgba(0,0,0,.9);
  border-radius:999px;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),background .2s var(--ease);
}
.quick-bar__link:hover{
  transform:translateX(-5px);
  background:rgba(36,16,24,.96);
  box-shadow:inset 0 0 0 1px var(--flame),0 12px 26px -14px rgba(0,0,0,.9);
}
.quick-bar__dot{
  width:6px;height:6px;border-radius:50%;background:var(--cyan);
  box-shadow:0 0 8px rgba(0,229,255,.75);flex:0 0 auto;
}

/* ---------- 14. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(3rem,8vw,6rem);
  background:linear-gradient(180deg,#0c1114 0%,#111417 100%);
  border-top:1px solid var(--line);
  color:var(--steel);
  font-size:.88rem;
}
.footer-band{
  height:4px;
  background:linear-gradient(90deg,var(--flame) 0%,var(--ember) 32%,var(--cyan) 68%,var(--indigo-black) 100%);
}
.footer-top{
  display:grid;grid-template-columns:minmax(230px,1fr) minmax(0,2.15fr);
  gap:clamp(1.6rem,4vw,3.5rem);
  padding-block:clamp(2.4rem,5vw,3.6rem) clamp(1.4rem,3vw,2.2rem);
}
.footer-brand__mark{
  display:flex;align-items:baseline;gap:.35rem;
  font-family:var(--font-display);font-size:1.7rem;font-weight:300;
  letter-spacing:.06em;color:var(--paper);line-height:1;
}
.footer-brand__mark-en{
  display:inline-block;font-weight:700;font-style:italic;color:var(--flame);
  transform:skewX(-7deg);
}
.footer-brand__line{
  margin-top:.7rem;font-family:var(--font-mono);font-size:.66rem;
  letter-spacing:.18em;text-transform:uppercase;color:var(--cyan);
}
.footer-brand__note{margin-top:.7rem;line-height:1.7;max-width:34ch;color:var(--steel)}
.footer-seal{
  display:inline-block;margin-top:1.1rem;
  font-family:var(--font-mono);font-size:.66rem;letter-spacing:.12em;
  color:var(--steel);padding:.32rem .58rem;
  border:1px dashed rgba(138,147,153,.45);
}
.footer-cols{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(1.2rem,3vw,2.4rem);
}
.footer-col__title{
  font-family:var(--font-mono);font-size:.64rem;font-weight:500;
  letter-spacing:.24em;text-transform:uppercase;color:var(--paper);
  padding-bottom:.55rem;margin-bottom:.75rem;
  border-bottom:1px solid var(--line);
}
.footer-col__list{display:grid;gap:.5rem}
.footer-col__item{font-size:.84rem;line-height:1.62;word-break:break-word}
.footer-col--info .footer-col__item{
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.02em;
}
.footer-link{color:var(--steel);transition:color .18s var(--ease)}
.footer-link:hover{color:var(--cyan)}
.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:.6rem 1.4rem;
  padding-block:1.1rem 1.6rem;
  border-top:1px solid var(--line-soft);
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.1em;color:var(--steel);
}
.footer-legal__item{margin:0}

/* ---------- 15. 平板 ---------- */
@media (max-width:1080px){
  .quick-bar{right:.6rem}
  .quick-bar__link{padding:.5rem .7rem;font-size:.7rem}
  .footer-top{grid-template-columns:minmax(0,1fr)}
  .footer-brand__note{max-width:52ch}
}

/* ---------- 16. 移动导航 ---------- */
@media (max-width:960px){
  .masthead{
    grid-template-columns:1fr auto 1fr;
    gap:.5rem;padding:.62rem var(--gutter) .5rem;
  }
  .masthead__edition{display:none}
  .masthead__tagline{display:none}
  .masthead__tools .masthead__tool{display:none}
  .nav-toggle{display:inline-flex}

  .primary-nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;
    background:linear-gradient(180deg,#0d1e23 0%,#101418 100%);
    border-top:1px solid var(--line);
    box-shadow:0 30px 46px -26px rgba(0,0,0,.98);
    max-height:calc(100vh - 110px);overflow-y:auto;
  }
  .primary-nav[data-open]{display:block;animation:navIn .2s var(--ease) both}
  .primary-nav__list{flex-direction:column;align-items:stretch;padding:.5rem var(--gutter) 1.1rem}
  .primary-nav__link{
    justify-content:flex-start;padding:.88rem .3rem;font-size:.96rem;
    border-bottom:1px solid var(--line-soft);
  }
  .primary-nav__link[aria-current="page"]{background:rgba(255,77,26,.1)}
  .primary-nav__link[aria-current="page"]::after{left:.3rem;right:.3rem;bottom:.3rem}
  @keyframes navIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}
}

/* ---------- 17. 手机 ---------- */
@media (max-width:720px){
  body{padding-bottom:3.5rem}
  .quick-bar{
    top:auto;bottom:0;left:0;right:0;
    transform:none;flex-direction:row;gap:0;
    background:rgba(13,17,20,.97);
    border-top:1px solid var(--line);
    padding:.3rem .4rem calc(.3rem + env(safe-area-inset-bottom,0px));
  }
  .quick-bar__link{
    flex:1 1 0;justify-content:center;border-radius:0;
    background:transparent;box-shadow:none;padding:.65rem .3rem;
    font-size:.72rem;
  }
  .quick-bar__link:hover{transform:none;background:rgba(255,77,26,.14);box-shadow:none}
  .footer-cols{grid-template-columns:minmax(0,1fr)}
  .footer-legal{flex-direction:column;align-items:flex-start}
}

@media (max-width:520px){
  body{font-size:16px}
  .masthead__wordmark{font-size:1.4rem}
  .footer-brand__mark{font-size:1.45rem}
  .paper{box-shadow:5px 5px 0 rgba(255,77,26,.18),10px 10px 0 rgba(0,229,255,.1)}
}

/* ---------- 18. 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;
  }
  .scroll-meter__fill{transition:none}
}