/* ============================================================
   必一赛场 · 共享样式 /assets/site.css
   夜江墨绿底 + 哨声荧光黄绿，纸张叠层与印刷边框
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root{
  --night:#0B2A25;
  --field:#123A32;
  --whistle:#C9F24D;
  --whistle-lit:#DCFF6B;
  --amber:#F2B705;
  --red:#E23B2E;
  --paper:#F5F2E7;
  --paper-line:#D8D5C8;
  --indigo:#22315C;
  --wine:#5A1F27;
  --mute:#7E8F86;
  --mint:#EAF3EE;
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-narrow:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
  --radius-pill:999px;
  --radius-lg:26px;
  --radius-md:16px;
  --shadow-sheet:0 18px 0 -10px rgba(0,0,0,.26),0 30px 50px -26px rgba(0,0,0,.6);
  --wrap:1180px;
  --gutter:clamp(16px,4vw,40px);
  --header-pad:clamp(10px,2vw,18px);
  --ease:cubic-bezier(.2,.7,.2,1);
}

/* ---------- 2. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit;background:none;border:0}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}
:focus-visible{outline:3px solid var(--whistle);outline-offset:3px;border-radius:6px}

/* ---------- 3. 基础排版 ---------- */
body{
  background:var(--night);
  color:var(--mint);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.8;
  letter-spacing:.012em;
  min-height:100vh;
  overflow-x:hidden;
}
h1,h2,h3,h4,h5{font-family:var(--font-narrow);font-weight:800;line-height:1.06;letter-spacing:-.02em}
h1{font-size:clamp(2.375rem,7vw,5.5rem);line-height:.98}
h2{font-size:clamp(1.625rem,3.4vw,2.25rem)}
h3{font-size:clamp(1.25rem,2vw,1.5rem);line-height:1.25}
h4{font-size:clamp(1.05rem,1.4vw,1.15rem);line-height:1.35}
p{text-wrap:pretty}
strong,b{font-weight:800}
#main-content{scroll-margin-top:118px}
.num,.stat-figure,.eyebrow,.footer-col-title,.breadcrumbs,.header-ticker,.footer-legal,.header-peek{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.num{letter-spacing:.05em}
.muted{color:var(--mute)}

/* ---------- 4. 容器与区块 ---------- */
.wrap{width:min(100% - var(--gutter) * 2,var(--wrap));margin-inline:auto}
.section{padding-block:clamp(48px,8vw,96px)}
.section--paper{background:var(--paper);color:var(--night)}
.section--paper .muted{color:#5C6B63}
.section--paper .lead{color:rgba(11,42,37,.8)}
.section--field{background:var(--field)}
.section--indigo{background:var(--indigo)}
.section--wine{background:var(--wine)}
.stack{display:flex;flex-direction:column;gap:clamp(14px,2.4vw,26px)}
.cluster{display:flex;flex-wrap:wrap;align-items:center;gap:.6rem}
.grid{display:grid;gap:clamp(16px,2.5vw,28px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr))}
.grid--4{grid-template-columns:repeat(auto-fit,minmax(min(100%,190px),1fr))}

/* ---------- 5. 文字层级组件 ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:.45em;
  font-size:.75rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--whistle);
}
.eyebrow::before{content:"["}
.eyebrow::after{content:"]"}
.section--paper .eyebrow{color:#3F6B2F}
.rule{
  display:block;height:1px;width:100%;background:currentColor;opacity:.25;
  transform-origin:left center;transition:transform .85s var(--ease)
}
[data-reveal]:not(.is-in) .rule{transform:scaleX(0)}
.lead{font-size:clamp(1.05rem,1.6vw,1.25rem);line-height:1.72;color:rgba(234,243,238,.86)}
.prose{max-width:38em}
.prose p + p{margin-top:1.05em}
.prose h2,.prose h3{margin-top:1.8em;margin-bottom:.5em}
.prose ul,.prose ol{margin-top:1em;display:flex;flex-direction:column;gap:.5em}
.prose li{padding-left:1.4em;position:relative}
.prose li::before{content:"—";position:absolute;left:0;opacity:.6}

.breadcrumbs{
  font-size:.78rem;letter-spacing:.08em;color:var(--mute);
  display:flex;flex-wrap:wrap;align-items:center;gap:.4em;
}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:.4em}
.breadcrumbs li{display:flex;align-items:center;gap:.4em}
.breadcrumbs li + li::before{content:"/";opacity:.55}
.breadcrumbs a:hover{color:var(--whistle)}

/* ---------- 6. 按钮 / 标签 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:.85em 1.5em;border-radius:var(--radius-pill);
  font-weight:700;font-size:1rem;border:1px solid transparent;cursor:pointer;
  transition:transform .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{background:var(--whistle);color:var(--night)}
.btn--primary:hover{background:var(--whistle-lit)}
.btn--ghost{border-color:rgba(234,243,238,.35);color:var(--mint)}
.btn--ghost:hover{border-color:var(--whistle);color:var(--whistle)}
.btn--paper{background:var(--paper);color:var(--night);border-color:var(--paper-line)}
.btn--paper:hover{background:#fff}

.tag{
  display:inline-flex;align-items:center;gap:.4em;
  padding:.18em .7em;border-radius:var(--radius-pill);
  font-family:var(--font-mono);font-size:.76rem;letter-spacing:.09em;
  border:1px solid currentColor;white-space:nowrap;
}
.tag--whistle{color:var(--whistle);background:rgba(201,242,77,.1)}
.tag--yellow{color:var(--amber);background:rgba(242,183,5,.13)}
.tag--red{color:var(--red);background:rgba(226,59,46,.15)}
.tag--quiet{color:var(--mute);background:transparent}
.section--paper .tag--whistle{color:#3F6B2F;background:rgba(63,107,47,.1)}

/* ---------- 7. 卡片 / 面板 / 数据 ---------- */
.paper-card{
  background:var(--paper);color:var(--night);
  border:1px solid var(--paper-line);border-radius:var(--radius-lg);
  padding:clamp(20px,3vw,34px);box-shadow:var(--shadow-sheet);
}
.paper-card h2,.paper-card h3{color:var(--night)}
.sheet{
  background:var(--field);border:1px solid rgba(201,242,77,.18);
  border-radius:var(--radius-lg);padding:clamp(20px,3vw,32px);
}
.sheet--indigo{background:var(--indigo);border-color:rgba(201,242,77,.22)}
.sheet--wine{background:var(--wine);border-color:rgba(242,183,5,.24)}
.stat{display:flex;flex-direction:column;gap:.3rem}
.stat-figure{
  font-weight:700;font-size:clamp(2rem,5vw,3.6rem);line-height:1;
  letter-spacing:.02em;color:var(--whistle);
}
.stat-label{font-size:.76rem;letter-spacing:.18em;text-transform:uppercase;color:var(--mute)}
.section--paper .stat-label{color:#5C6B63}
.section--paper .stat-figure{color:#2E4A22}

/* ---------- 8. 章节轨 / 服务路径 / 横向带 ---------- */
.rail{position:relative;padding-left:clamp(30px,5vw,64px)}
.rail::before{content:"";position:absolute;left:11px;top:0;bottom:0;width:1px;background:rgba(234,243,238,.18)}
.section--paper .rail::before{background:rgba(11,42,37,.18)}
.rail-item{position:relative;padding-block:clamp(14px,2.2vw,24px)}
.rail-item::before{
  content:"";position:absolute;
  left:calc(-1 * clamp(30px,5vw,64px) + 7px);
  top:calc(clamp(14px,2.2vw,24px) + .55em);
  width:9px;height:9px;border-radius:50%;
  background:var(--whistle);box-shadow:0 0 0 4px rgba(201,242,77,.14);
}

.path{display:grid;gap:14px}
.path-step{
  position:relative;
  border:1px solid rgba(201,242,77,.2);background:rgba(18,58,50,.62);
  border-radius:var(--radius-md);padding:18px 20px 18px 60px;
}
.path-step::before{
  content:attr(data-step);
  position:absolute;left:16px;top:18px;
  width:28px;height:28px;border-radius:9px;
  display:grid;place-items:center;
  background:var(--whistle);color:var(--night);
  font-family:var(--font-mono);font-weight:700;font-size:.82rem;letter-spacing:0;
}
.path-step + .path-step::after{
  content:"";position:absolute;left:29px;top:-14px;width:1px;height:14px;
  background:rgba(201,242,77,.35);
}

.scroll-rail{
  display:flex;gap:clamp(12px,2vw,20px);
  overflow-x:auto;overscroll-behavior-x:contain;
  scroll-snap-type:x mandatory;
  padding-bottom:16px;
  scrollbar-width:thin;scrollbar-color:var(--whistle) rgba(234,243,238,.12);
}
.scroll-rail > *{flex:0 0 min(300px,78vw);scroll-snap-align:start}
.scroll-rail::-webkit-scrollbar{height:5px}
.scroll-rail::-webkit-scrollbar-track{background:rgba(234,243,238,.12);border-radius:99px}
.scroll-rail::-webkit-scrollbar-thumb{background:var(--whistle);border-radius:99px}

.filter-bar{
  display:flex;gap:.5rem;overflow-x:auto;padding-block:4px 12px;
  scroll-snap-type:x proximity;
}
.filter-bar::-webkit-scrollbar{height:4px}
.filter-btn{
  flex:0 0 auto;padding:.5em 1.05em;border-radius:var(--radius-pill);
  border:1px solid rgba(234,243,238,.24);color:var(--mint);
  font-size:.85rem;white-space:nowrap;cursor:pointer;scroll-snap-align:start;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.filter-btn:hover{border-color:var(--whistle);color:var(--whistle)}
.filter-btn[aria-pressed="true"]{background:var(--whistle);color:var(--night);border-color:var(--whistle);font-weight:700}

.toc-float{position:sticky;top:110px;align-self:start}
.toc-float ol{display:flex;flex-direction:column;gap:2px}
.toc-float a{
  display:block;padding:.5rem .85rem;font-size:.9rem;color:var(--mute);
  border-left:2px solid rgba(234,243,238,.15);
  transition:color .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease);
}
.toc-float a:hover{color:var(--mint)}
.toc-float a.is-active,.toc-float a[aria-current="true"]{
  color:var(--night);background:var(--whistle);border-left-color:var(--whistle);font-weight:700;
}

/* ---------- 9. 图片容器 ---------- */
.media{
  position:relative;overflow:hidden;margin:0;
  border-radius:var(--radius-lg);
  border:1px solid rgba(201,242,77,.18);
  background:linear-gradient(145deg,var(--field),var(--night) 65%);
}
.media img,.media video{width:100%;height:100%;object-fit:cover}
.media--16x9{aspect-ratio:16 / 9}
.media--4x3{aspect-ratio:4 / 3}
.media--3x4{aspect-ratio:3 / 4}
.media--1x1{aspect-ratio:1 / 1}
.media--empty{
  display:grid;place-items:center;
  font-family:var(--font-mono);font-size:.76rem;letter-spacing:.24em;
  text-transform:uppercase;color:var(--mute);
}
.media-frame{margin:0;display:block}
.media-caption{
  margin-top:.65rem;font-family:var(--font-mono);font-size:.78rem;
  letter-spacing:.05em;color:var(--mute);
}

/* ---------- 10. 页头 ---------- */
.skip-link{
  position:absolute;left:14px;top:-120px;z-index:200;
  padding:.7em 1.15em;border-radius:0 0 12px 12px;
  background:var(--whistle);color:var(--night);font-weight:700;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:0}

.site-header{
  position:sticky;top:0;z-index:80;
  padding:var(--header-pad) var(--gutter) 0;
  transition:padding .28s var(--ease);
}
.site-header::before{
  content:"";position:absolute;left:0;right:0;top:0;bottom:-28px;
  background:linear-gradient(180deg,rgba(11,42,37,.97),rgba(11,42,37,.72) 58%,rgba(11,42,37,0));
  pointer-events:none;z-index:-1;
}
.header-shell{
  position:relative;
  width:min(100%,var(--wrap));margin-inline:auto;
  display:flex;align-items:center;gap:clamp(10px,2vw,22px);
  padding:clamp(8px,1.2vw,12px) clamp(12px,2vw,20px);
  background:rgba(11,42,37,.88);
  border:1px solid rgba(201,242,77,.24);
  border-radius:var(--radius-pill);
  box-shadow:0 16px 38px -24px rgba(0,0,0,.95);
  backdrop-filter:blur(14px);
  transition:padding .28s var(--ease),border-color .28s var(--ease);
}
.brand{display:inline-flex;align-items:center;gap:.65rem;flex:0 0 auto}
.brand-mark{
  display:grid;place-items:center;flex:0 0 auto;
  width:38px;height:38px;border-radius:12px;
  background:var(--whistle);color:var(--night);
  font-family:var(--font-narrow);font-weight:800;font-size:1.05rem;letter-spacing:0;
  transition:width .28s var(--ease),height .28s var(--ease),font-size .28s var(--ease);
}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-family:var(--font-narrow);font-weight:800;font-size:1.05rem;letter-spacing:.02em}
.brand-tagline{font-size:.7rem;letter-spacing:.1em;color:var(--mute)}
.header-ticker{
  display:none;align-items:center;gap:.55rem;flex:1 1 auto;min-width:0;
  padding-left:1rem;border-left:1px solid rgba(201,242,77,.24);
  font-size:.76rem;letter-spacing:.05em;color:var(--whistle);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.header-ticker-dot{
  flex:0 0 auto;width:7px;height:7px;border-radius:50%;
  background:var(--whistle);box-shadow:0 0 0 4px rgba(201,242,77,.16);
  animation:ticker-pulse 2.4s ease-in-out infinite;
}
@keyframes ticker-pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.42;transform:scale(.8)}}

.nav-toggle{
  display:inline-flex;align-items:center;gap:.55rem;margin-left:auto;
  padding:.5rem .9rem;border-radius:var(--radius-pill);
  border:1px solid rgba(201,242,77,.3);color:var(--mint);
  font-size:.85rem;cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{background:rgba(201,242,77,.12);color:var(--whistle)}
.nav-toggle[aria-expanded="true"]{background:var(--whistle);color:var(--night);border-color:var(--whistle)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{background:var(--night);box-shadow:0 -6px 0 var(--night),0 6px 0 var(--night)}
.nav-toggle-bars{
  display:block;width:18px;height:2px;border-radius:2px;background:var(--whistle);
  box-shadow:0 -6px 0 var(--whistle),0 6px 0 var(--whistle);
}
.nav-toggle-text{letter-spacing:.1em}

.site-nav{display:flex;align-items:center;gap:clamp(6px,1.3vw,16px);margin-left:auto}
.nav-list{display:flex;align-items:center;gap:clamp(2px,.7vw,8px)}
.nav-link{
  display:inline-block;padding:.45em .78em;border-radius:var(--radius-pill);
  font-size:.92rem;color:rgba(234,243,238,.82);white-space:nowrap;
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.nav-link:hover{color:var(--whistle);background:rgba(201,242,77,.1)}
.nav-link[aria-current="page"]{color:var(--night);background:var(--whistle);font-weight:700}
.nav-cta{
  display:inline-flex;align-items:center;justify-content:center;
  padding:.5em 1.05em;border-radius:var(--radius-pill);
  background:var(--whistle);color:var(--night);font-weight:800;font-size:.9rem;
  white-space:nowrap;transition:background-color .18s var(--ease);
}
.nav-cta:hover{background:var(--whistle-lit)}

.header-peek{
  display:none;align-items:center;flex:0 0 auto;
  padding:.4em .85em;border-radius:var(--radius-pill);
  border:1px solid rgba(201,242,77,.3);color:var(--whistle);
  font-size:.75rem;letter-spacing:.14em;cursor:pointer;
  transition:background-color .18s var(--ease);
}
.header-peek:hover{background:rgba(201,242,77,.14)}

.site-header.is-compact{padding-top:6px}
.site-header.is-compact .header-shell{padding:.35rem .5rem .35rem .7rem}
.site-header.is-compact .brand-mark{width:30px;height:30px;border-radius:10px;font-size:.9rem}
.site-header.is-compact:not(.is-peek) .brand-tagline{display:none}
.site-header.is-compact .nav-link{padding:.35em .7em;font-size:.86rem}

@media (min-width:1080px){
  .header-ticker{display:flex}
  .site-header.is-compact:not(.is-peek) .header-ticker{display:none}
}
@media (min-width:960px){
  .nav-toggle{display:none}
  .site-header.is-compact .header-peek{display:inline-flex}
  .site-header.is-compact.is-peek .header-peek{display:none}
}
@media (max-width:959px){
  .site-nav{
    position:absolute;left:0;right:0;top:calc(100% + 10px);
    display:none;flex-direction:column;align-items:stretch;gap:8px;
    margin-left:0;padding:14px;
    background:rgba(11,42,37,.98);
    border:1px solid rgba(201,242,77,.26);
    border-radius:24px;
    box-shadow:0 30px 52px -28px rgba(0,0,0,.95);
  }
  .site-nav[data-open]{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-link{padding:.7em .9em;font-size:1rem;border-radius:14px}
  .nav-cta{margin-top:6px;padding:.75em 1.1em;font-size:.95rem}
}

/* ---------- 11. 页脚 ---------- */
.site-footer{
  margin-top:clamp(48px,8vw,96px);
  background:var(--field);
  border-top:1px solid rgba(201,242,77,.22);
  color:var(--mint);
}
.footer-stripe{display:flex;height:6px}
.footer-stripe span{flex:1}
.footer-stripe span:nth-child(1){background:var(--whistle)}
.footer-stripe span:nth-child(2){background:var(--amber)}
.footer-stripe span:nth-child(3){background:var(--red)}
.footer-inner{
  width:min(100% - var(--gutter) * 2,var(--wrap));margin-inline:auto;
  padding:clamp(36px,6vw,72px) 0 clamp(24px,4vw,40px);
  display:grid;gap:clamp(26px,4vw,52px);grid-template-columns:1fr;
}
.footer-brand{min-width:0}
.footer-logo{
  font-family:var(--font-narrow);font-weight:800;letter-spacing:.04em;
  font-size:clamp(1.3rem,2.4vw,1.6rem);color:var(--whistle);
}
.footer-summary{
  margin-top:.9rem;max-width:34em;
  font-size:.95rem;color:rgba(234,243,238,.78);
}
.footer-contact{
  margin-top:1.3rem;font-size:.84rem;line-height:2;
  font-family:var(--font-mono);letter-spacing:.03em;color:var(--mute);
  word-break:break-word;
}
.footer-cols{
  display:grid;gap:clamp(20px,3vw,34px);
  grid-template-columns:repeat(auto-fit,minmax(min(100%,150px),1fr));
}
.footer-col-title{
  font-size:.76rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--whistle);font-weight:800;margin-bottom:.95rem;
}
.footer-links{display:flex;flex-direction:column;gap:.6rem;font-size:.95rem}
.footer-links a{color:rgba(234,243,238,.8);transition:color .18s var(--ease)}
.footer-links a:hover{color:var(--whistle);text-decoration:underline;text-underline-offset:4px}
.footer-legal{
  width:min(100% - var(--gutter) * 2,var(--wrap));margin-inline:auto;
  padding:clamp(16px,2.5vw,22px) 0 clamp(28px,4vw,40px);
  border-top:1px solid rgba(216,213,200,.18);
  display:flex;flex-wrap:wrap;align-items:center;gap:.55rem 1.5rem;
  font-size:.78rem;letter-spacing:.05em;color:var(--mute);
}
@media (min-width:900px){
  .footer-inner{grid-template-columns:minmax(0,1.1fr) minmax(0,1.7fr)}
}

/* ---------- 12. 浮动 UI ---------- */
.scroll-progress{
  position:fixed;left:0;top:0;z-index:120;height:3px;width:100%;
  transform:scaleX(var(--p,0));transform-origin:left center;
  background:linear-gradient(90deg,var(--whistle),var(--amber));
  pointer-events:none;
}
.back-to-top{
  position:fixed;right:clamp(14px,3vw,28px);bottom:clamp(14px,3vw,28px);z-index:110;
  width:52px;height:52px;border-radius:50%;
  display:grid;place-items:center;
  background:var(--whistle);color:var(--night);
  font-family:var(--font-mono);font-weight:700;font-size:1.1rem;
  box-shadow:0 14px 30px -14px rgba(0,0,0,.9);
  cursor:pointer;opacity:0;visibility:hidden;transform:translateY(14px);
  transition:opacity .28s var(--ease),transform .28s var(--ease),visibility .28s var(--ease);
}
.back-to-top:hover{background:var(--whistle-lit)}
.back-to-top.is-visible{opacity:1;visibility:visible;transform:none}

/* ---------- 13. 显现动效 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(18px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- 14. 无障碍与减弱动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1 !important;transform:none !important}
  .rule{transform:none !important}
  .btn:hover{transform:none}
}