/* ============================================================
   LOVE赛场 · /assets/site.css
   共享外壳：品牌轨道头 / 三段式页脚 / 基础组件
   ============================================================ */

*,*::before,*::after{box-sizing:border-box}

:root{
  --black-track:#05070C;
  --panel-navy:#0B1220;
  --slate:#121C2E;
  --lime:#C8FF3D;
  --volt:#2FE6FF;
  --orange:#FF8A2B;
  --ink:#E9F1FF;
  --muted:#9AAEC9;
  --field-green:#5BE58C;
  --grid-line:#2A3A52;
  --line:rgba(42,58,82,.6);
  --rail:84px;
  --head-h:76px;
  --head-h-min:56px;
  --gap:24px;
  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}

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

body{
  margin:0;
  background:var(--black-track);
  color:var(--ink);
  font-family:var(--font-display);
  font-size:16px;
  line-height:1.8;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

h1,h2,h3,h4,h5,h6{
  margin:0;
  font-weight:800;
  line-height:1.15;
  letter-spacing:-.02em;
  color:var(--ink);
}
h1{font-size:clamp(2.25rem,4.2vw,4.5rem);font-stretch:87.5%}
h2{font-size:clamp(1.55rem,2.4vw,2.25rem);font-stretch:87.5%}
h3{font-size:1.375rem;letter-spacing:-.01em}
h4{font-size:1.0625rem;letter-spacing:0}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0}
::selection{background:var(--lime);color:#05070C}
:focus-visible{outline:2px solid var(--volt);outline-offset:3px;border-radius:2px}

@media (min-width:901px){
  body{padding-left:var(--rail)}
  body::before{
    content:"";position:fixed;top:0;bottom:0;left:calc(var(--rail) - 1px);
    width:1px;background:var(--line);z-index:150;pointer-events:none;
  }
}

/* ---------- 通用布局 ---------- */
.wrap{width:min(1240px,100% - 40px);margin-inline:auto}
.section{padding:clamp(56px,7vw,104px) 0}
.section--tight{padding:clamp(30px,4vw,56px) 0}
.below-head{padding-top:calc(var(--head-h) + 24px)}
.rule{height:1px;background:var(--line);border:0;margin:0}

.grid{display:grid;grid-template-columns:repeat(12,1fr);gap:var(--gap)}
.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}

/* ---------- 文本原子 ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font:700 12px/1 var(--font-mono);letter-spacing:.2em;text-transform:uppercase;
  color:var(--volt);
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--lime)}

.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em;color:var(--volt)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;border:1px solid rgba(200,255,61,.5);border-radius:2px;
  color:var(--lime);font:700 12px/1.2 var(--font-mono);
  letter-spacing:.12em;text-transform:uppercase;white-space:nowrap;
}
.tag--volt{border-color:rgba(47,230,255,.5);color:var(--volt)}
.tag--orange{border-color:rgba(255,138,43,.55);color:var(--orange)}

.prose{max-width:68ch;color:var(--muted);font-size:16px;line-height:1.8;letter-spacing:.01em}
.prose p + p{margin-top:16px}
.prose h2,.prose h3,.prose h4{color:var(--ink);margin:1.6em 0 .6em}
.prose strong{color:var(--ink);font-weight:700}
.prose a{color:var(--volt);border-bottom:1px solid rgba(47,230,255,.35)}
.prose a:hover{border-bottom-color:var(--volt)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 22px;border:1px solid var(--lime);border-radius:2px;
  background:transparent;color:var(--lime);
  font:700 13px/1 var(--font-display);letter-spacing:.1em;text-transform:uppercase;
  cursor:pointer;transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn:hover,.btn:focus-visible{background:var(--lime);color:#05070C}
.btn--solid{background:var(--lime);color:#05070C}
.btn--solid:hover,.btn--solid:focus-visible{background:transparent;color:var(--lime)}
.btn--ghost{border-color:var(--line);color:var(--ink)}
.btn--ghost:hover,.btn--ghost:focus-visible{background:transparent;border-color:var(--volt);color:var(--volt)}

/* ---------- 面包屑 ---------- */
.crumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font:500 12px/1.4 var(--font-mono);letter-spacing:.1em;
  color:var(--muted);text-transform:uppercase;
}
.crumbs li{display:flex;align-items:center;gap:8px}
.crumbs li + li::before{content:"/";color:var(--grid-line)}
.crumbs a{color:var(--muted);transition:color .18s var(--ease)}
.crumbs a:hover{color:var(--volt)}
.crumbs [aria-current="page"]{color:var(--ink)}

/* ---------- 图片容器基础规则 ---------- */
.media{
  position:relative;display:block;width:100%;overflow:hidden;
  border:1px solid var(--line);border-radius:2px;
  background:linear-gradient(140deg,var(--slate) 0%,var(--black-track) 58%,var(--panel-navy) 100%);
}
.media::before{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:2;
  background-image:
    linear-gradient(rgba(42,58,82,.38) 1px,transparent 1px),
    linear-gradient(90deg,rgba(42,58,82,.38) 1px,transparent 1px);
  background-size:48px 48px;
  opacity:.55;
  mask-image:linear-gradient(180deg,rgba(0,0,0,.9),transparent 78%);
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.9),transparent 78%);
}
.media::after{
  content:"";position:absolute;left:-10%;right:-10%;bottom:-40%;height:75%;pointer-events:none;z-index:1;
  background:radial-gradient(60% 100% at 50% 100%,rgba(47,230,255,.22),transparent 72%);
}
.media > img{
  position:relative;z-index:0;width:100%;height:100%;
  object-fit:cover;filter:saturate(1.05) contrast(1.06);
}
.media__tag{
  position:absolute;z-index:3;left:12px;bottom:12px;
  padding:4px 9px;background:rgba(5,7,12,.82);border:1px solid rgba(200,255,61,.5);
  border-radius:2px;color:var(--lime);
  font:700 11px/1.2 var(--font-mono);letter-spacing:.12em;text-transform:uppercase;
}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:3/4}

/* ---------- 滚动显现协议 ---------- */
[data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
[data-reveal].is-in{opacity:1;transform:none}

/* ============================================================
   头部：左侧品牌轨道 + 右侧栏目组
   ============================================================ */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:500;
  padding:12px 18px;border-radius:2px;
  background:var(--lime);color:#05070C;
  font:700 13px/1 var(--font-display);letter-spacing:.08em;
  transform:translateY(-180%);
  transition:transform .2s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0);outline:2px solid var(--volt);outline-offset:2px}

.site-head{position:fixed;top:0;left:0;right:0;z-index:300;pointer-events:none}
.site-head > *{pointer-events:auto}

/* 左轨 */
.head-rail{
  position:fixed;top:0;left:0;bottom:0;width:var(--rail);
  display:flex;flex-direction:column;align-items:center;justify-content:space-between;
  padding:22px 0 20px;
  background:linear-gradient(180deg,#080C14 0%,var(--black-track) 100%);
  border-right:1px solid var(--line);
  transition:transform .3s var(--ease),opacity .3s var(--ease);
}
.head-rail::before{
  content:"";position:absolute;top:0;right:-1px;width:1px;height:112px;
  background:linear-gradient(180deg,var(--lime),rgba(200,255,61,0));
}
.rail-brand{display:flex;flex-direction:column;align-items:center;gap:8px;text-decoration:none}
.rail-brand__word{
  writing-mode:vertical-rl;text-orientation:mixed;
  font:800 15px/1 var(--font-display);letter-spacing:.22em;color:var(--ink);
}
.rail-brand__word--cn{color:var(--volt);font-size:13px;letter-spacing:.3em}
.rail-brand:hover .rail-brand__word{color:var(--lime)}

.rail-ticks{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:12px;width:100%;margin:24px 0;
}
.rail-tick{width:14px;height:1px;background:var(--line);flex:0 0 auto}
.rail-tick:nth-child(3n+1){width:24px;background:rgba(47,230,255,.45)}
.rail-tick--hot{width:34px;height:2px;background:var(--lime);box-shadow:0 0 10px rgba(200,255,61,.6)}

.rail-meta{
  writing-mode:vertical-rl;
  display:flex;align-items:center;gap:8px;
  font:700 10px/1 var(--font-mono);letter-spacing:.3em;text-transform:uppercase;
  color:rgba(154,174,201,.75);
}
.rail-meta::before{
  content:"";width:5px;height:5px;border-radius:50%;
  background:var(--lime);box-shadow:0 0 8px var(--lime);
}

/* 顶部横条 */
.head-bar{
  position:fixed;top:0;left:var(--rail);right:0;
  height:var(--head-h);
  display:flex;align-items:center;gap:24px;
  padding:0 clamp(16px,3vw,40px);
  transition:left .3s var(--ease),height .3s var(--ease),
             background .3s var(--ease),border-color .3s var(--ease),
             box-shadow .3s var(--ease);
  border-bottom:1px solid transparent;
}
.head-brand{
  margin-right:auto;
  display:inline-flex;align-items:baseline;gap:7px;
  font:800 18px/1 var(--font-display);letter-spacing:.03em;color:var(--ink);
  opacity:0;transform:translateY(-8px);pointer-events:none;
  transition:opacity .25s var(--ease),transform .25s var(--ease);
}
.head-brand span{font-size:12px;letter-spacing:.22em;color:var(--lime)}
.head-brand:hover span{color:var(--volt)}

/* 导航 */
.nav{margin-left:auto}
.nav__list{display:flex;align-items:center;gap:clamp(10px,1.7vw,28px)}
.nav__link{
  position:relative;display:inline-block;padding:8px 2px;
  font:600 14px/1 var(--font-display);letter-spacing:.05em;color:var(--muted);
  transition:color .18s var(--ease);
}
.nav__link::after{
  content:"";position:absolute;left:0;bottom:0;width:18px;height:2px;
  background:var(--lime);transform:scaleX(0);transform-origin:left center;
  transition:transform .22s var(--ease);
}
.nav__link:hover,.nav__link:focus-visible{color:var(--ink)}
.nav__link:hover::after,.nav__link:focus-visible::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--ink)}
.nav__link[aria-current="page"]::after{transform:scaleX(1)}

/* 移动按钮 */
.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:9px 12px;border:1px solid rgba(200,255,61,.45);border-radius:2px;
  background:rgba(200,255,61,.06);color:var(--lime);cursor:pointer;
  transition:background .18s var(--ease),border-color .18s var(--ease);
}
.nav-toggle:hover{background:rgba(200,255,61,.16);border-color:var(--lime)}
.nav-toggle__label{font:700 13px/1 var(--font-display);letter-spacing:.12em}
.nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:18px}
.nav-toggle__bars span{display:block;height:2px;width:100%;background:currentColor;transition:transform .22s var(--ease),opacity .18s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) 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(-6px) rotate(-45deg)}

/* 阅读进度 */
.head-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:rgba(42,58,82,.4);opacity:0;transition:opacity .25s var(--ease);
}
.head-progress__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--volt),var(--lime));
  box-shadow:0 0 12px rgba(47,230,255,.55);
  transition:width .08s linear;
}

/* 收起态 */
.site-head.is-collapsed .head-rail{transform:translateX(-100%);opacity:0}
.site-head.is-collapsed .head-bar{
  left:0;height:var(--head-h-min);
  background:rgba(11,18,32,.94);
  border-bottom-color:var(--line);
  box-shadow:0 12px 32px rgba(0,0,0,.5);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.site-head.is-collapsed .head-brand{opacity:1;transform:none;pointer-events:auto}
.site-head.is-collapsed .head-progress{opacity:1}

/* ============================================================
   页脚
   ============================================================ */
.site-foot{
  position:relative;
  margin-top:clamp(56px,8vw,104px);
  background:var(--panel-navy);
  border-top:1px solid var(--line);
}
.site-foot::before{
  content:"";position:absolute;top:-1px;left:0;width:180px;height:1px;
  background:var(--lime);box-shadow:0 0 12px rgba(200,255,61,.55);
}
.foot-grid{
  display:grid;
  grid-template-columns:minmax(220px,1.4fr) repeat(2,minmax(140px,.85fr)) minmax(240px,1.25fr);
  gap:44px 32px;
  padding:clamp(40px,5vw,64px) 0 34px;
}
.foot-brand__link{
  display:inline-flex;align-items:baseline;gap:8px;
  font:800 22px/1 var(--font-display);letter-spacing:.02em;color:var(--ink);
}
.foot-brand__link span{font-size:13px;letter-spacing:.24em;color:var(--lime)}
.foot-brand__tag{margin-top:14px;max-width:22ch;font-size:14px;line-height:1.7;color:var(--muted)}
.foot-brand__meta{margin-top:14px;font:500 12px/1.6 var(--font-mono);letter-spacing:.06em;color:rgba(154,174,201,.8)}

.foot-col{border-left:1px solid var(--line);padding-left:28px;min-width:0}
.foot-col__title{
  font:700 12px/1 var(--font-mono);letter-spacing:.22em;text-transform:uppercase;
  color:var(--volt);margin-bottom:18px;
}
.foot-col__list li + li{margin-top:11px}
.foot-col__list a{
  position:relative;display:inline-block;
  font-size:14px;color:var(--muted);
  transition:color .18s var(--ease),transform .18s var(--ease);
}
.foot-col__list a::before{
  content:"";position:absolute;left:-12px;top:50%;width:6px;height:1px;
  background:var(--lime);opacity:0;transform:translateX(-4px);
  transition:opacity .18s var(--ease),transform .18s var(--ease);
}
.foot-col__list a:hover,.foot-col__list a:focus-visible{color:var(--ink)}
.foot-col__list a:hover::before,.foot-col__list a:focus-visible::before{opacity:1;transform:none}

.foot-contact li{display:flex;gap:10px;font-size:13px;line-height:1.7;color:var(--muted)}
.foot-contact__k{
  flex:0 0 34px;font:700 11px/1.9 var(--font-mono);letter-spacing:.14em;
  text-transform:uppercase;color:rgba(154,174,201,.7);
}
.foot-contact__v{word-break:break-word;min-width:0}
.foot-col__cta{
  display:inline-flex;align-items:center;gap:8px;margin-top:18px;
  padding:9px 16px;border:1px solid rgba(47,230,255,.45);border-radius:2px;
  color:var(--volt);font:700 12px/1 var(--font-display);letter-spacing:.12em;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.foot-col__cta:hover,.foot-col__cta:focus-visible{background:var(--volt);color:#05070C;border-color:var(--volt)}

.foot-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:14px 28px;
  padding:22px 0 0;border-top:1px solid var(--line);
}
.foot-legal{font:500 12px/1.6 var(--font-mono);letter-spacing:.05em;color:rgba(154,174,201,.75)}
.foot-links{display:flex;flex-wrap:wrap;gap:8px 22px}
.foot-links a{
  font:500 12px/1.6 var(--font-mono);letter-spacing:.05em;color:var(--muted);
  border-bottom:1px solid transparent;transition:color .18s var(--ease),border-color .18s var(--ease);
}
.foot-links a:hover,.foot-links a:focus-visible{color:var(--lime);border-bottom-color:var(--lime)}
.foot-icp{
  padding:12px 0 30px;text-align:right;
  font:500 12px/1.6 var(--font-mono);letter-spacing:.08em;color:rgba(154,174,201,.6);
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1180px){
  .foot-col{border-left:0;padding-left:0}
  .foot-grid{grid-template-columns:minmax(200px,1.2fr) 1fr 1fr;gap:36px 28px}
  .foot-col--contact{grid-column:1 / -1;border-top:1px solid var(--line);padding-top:28px}
  .foot-contact{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 28px}
  .foot-contact li + li{margin-top:0}
}

@media (max-width:1100px){
  .span-4,.span-5,.span-7{grid-column:span 6}
  .span-8{grid-column:span 12}
}

@media (max-width:900px){
  .head-rail{display:none}
  .head-bar{
    left:0;height:62px;padding:0 16px;gap:12px;
    background:rgba(5,7,12,.92);
    border-bottom:1px solid var(--line);
    -webkit-backdrop-filter:blur(8px);
    backdrop-filter:blur(8px);
  }
  .head-brand{opacity:1;transform:none;pointer-events:auto;font-size:17px}
  .nav-toggle{display:inline-flex}
  .nav{
    position:fixed;top:62px;left:0;right:0;margin:0;
    display:none;
    background:var(--panel-navy);
    border-bottom:1px solid var(--line);
    padding:8px 16px 18px;
    max-height:calc(100vh - 62px);
    overflow-y:auto;
    box-shadow:0 20px 40px rgba(0,0,0,.55);
  }
  .nav[data-open]{display:block}
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__link{
    display:block;padding:14px 4px;font-size:15px;
    border-bottom:1px solid var(--line);
  }
  .nav__link::after{display:none}
  .nav__link[aria-current="page"]{color:var(--lime)}
  .nav__link[aria-current="page"] span{}
  .site-head.is-collapsed .head-bar{height:62px;left:0}
  .head-progress{opacity:1}
  .site-foot{margin-top:64px}
  .foot-grid{grid-template-columns:1fr 1fr;gap:32px 24px}
  .foot-brand{grid-column:1 / -1}
  .foot-col--contact{grid-column:1 / -1}
  .foot-contact{grid-template-columns:1fr}
  .foot-icp{text-align:left}
  .below-head{padding-top:calc(62px + 20px)}
}

@media (max-width:640px){
  .wrap{width:calc(100% - 32px)}
  .grid{grid-template-columns:repeat(6,1fr);gap:16px}
  .span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:span 6}
  .foot-grid{grid-template-columns:1fr;gap:28px}
  .foot-bottom{flex-direction:column;align-items:flex-start}
  .media::before{background-size:32px 32px}
}

/* ============================================================
   降低动效
   ============================================================ */
@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-behavior:auto !important;
  }
  [data-reveal]{opacity:1;transform:none}
  .head-progress__bar{transition:none}
}