/* ===== 必一体育 · shared site kit ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,picture,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit;text-decoration:none}
main{display:block}

:root{
  --ink:#081A2E;
  --ink-2:#0F2B49;
  --ink-3:#0A2138;
  --cyan:#2DF5D4;
  --orange:#FF6B2C;
  --warm:#F6F1E7;
  --steel:#8FA6BA;
  --teal:#0B5D5B;
  --signal:#FFD166;
  --mist:#C9D8E4;
  --line:rgba(201,216,228,.18);
  --line-strong:rgba(201,216,228,.34);
  --radius:18px;
  --radius-sm:10px;
  --maxw:1320px;
  --gutter:clamp(20px,4vw,56px);
  --font-display:"Archivo Black","Noto Sans SC","Heiti SC",system-ui,-apple-system,sans-serif;
  --font-body:"Noto Sans SC",Inter,system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

body{
  background:var(--ink);
  color:var(--warm);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

:focus-visible{outline:3px solid var(--cyan);outline-offset:3px;border-radius:4px}
::selection{background:var(--cyan);color:var(--ink)}

/* ===== 排版 ===== */
.display-title{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(3.5rem,8vw,8rem);
  line-height:.88;
  letter-spacing:-.04em;
  text-wrap:balance;
}
.section-title{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(2rem,4vw,4rem);
  line-height:.95;
  letter-spacing:-.03em;
  margin-bottom:.55em;
  text-wrap:balance;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{content:"";width:26px;height:2px;background:currentColor}
.lede{font-size:clamp(1rem,1.5vw,1.15rem);line-height:1.75;color:var(--mist);max-width:62ch}
.note{font-size:14px;line-height:1.7;color:var(--steel);max-width:46ch}
.mono{font-family:var(--font-mono);letter-spacing:.05em;font-variant-numeric:tabular-nums}
.rule{height:1px;background:var(--line);border:0;margin:0}

/* ===== 容器与节奏 ===== */
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.container--narrow{max-width:820px}
.container--wide{max-width:1480px}
.section{padding-block:clamp(48px,7vw,96px)}
.section--tight{padding-block:clamp(28px,4vw,56px)}
.section--ink2{background:var(--ink-2)}
.section--warm{background:var(--warm);color:var(--ink)}
.section--warm .lede{color:#3A4C5E}
.section--warm .note{color:#5A6B7B}
.section--warm .eyebrow{color:#0B5D5B}

/* ===== 按钮 ===== */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:14px 22px;
  border:1px solid transparent;
  border-radius:999px;
  font-family:var(--font-body);
  font-weight:700;
  font-size:14px;
  letter-spacing:.04em;
  line-height:1.2;
  cursor:pointer;
  transition:transform .18s ease,background-color .18s ease,color .18s ease,border-color .18s ease,box-shadow .18s ease;
}
.btn--sm{padding:10px 16px;font-size:13px}
.btn--block{display:flex;width:100%;justify-content:center}
.btn--cyan{background:var(--cyan);color:var(--ink);box-shadow:0 6px 20px rgba(45,245,212,.16)}
.btn--cyan:hover{background:#57ffdf}
.btn--orange{background:var(--orange);color:var(--ink)}
.btn--orange:hover{background:#ff8551}
.btn--ghost{background:transparent;border-color:var(--line-strong);color:var(--warm)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn__arrow{font-family:var(--font-mono);transition:transform .18s ease}
.btn:hover .btn__arrow{transform:translateX(4px)}

/* ===== 标签 / 卡片 / 网格 ===== */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--line);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--mist);
  white-space:nowrap;
}
.tag--cyan{border-color:rgba(45,245,212,.5);background:rgba(45,245,212,.1);color:var(--cyan)}
.tag--orange{border-color:rgba(255,107,44,.55);background:rgba(255,107,44,.12);color:#FFB08A}
.tag--signal{border-color:rgba(255,209,102,.5);background:rgba(255,209,102,.12);color:var(--signal)}

.panel{
  background:var(--ink-2);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:clamp(18px,2.4vw,28px);
}
.panel--warm{background:var(--warm);color:var(--ink);border-color:transparent}
.panel--accent{background:linear-gradient(150deg,var(--teal),var(--ink-2) 70%);border-color:rgba(45,245,212,.28)}
.panel-hover{transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease}
.panel-hover:hover{transform:translateY(-4px);border-color:var(--cyan);box-shadow:0 14px 34px rgba(0,0,0,.32)}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.split{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:clamp(20px,3vw,44px);align-items:start}
.split--reverse{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
.lift-1{margin-top:24px}
.lift-2{margin-top:48px}
.edge-slant{clip-path:polygon(0 3vw,100% 0,100% 100%,0 100%)}

/* ===== 图片容器基础（页面阶段放占位图） ===== */
.media-frame{
  position:relative;
  overflow:hidden;
  width:100%;
  aspect-ratio:16/9;
  border-radius:var(--radius);
  background:linear-gradient(135deg,var(--ink-2),var(--teal));
  border:1px solid var(--line);
}
.media-frame>img,.media-frame>picture>img{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";
  position:absolute;
  inset:auto 0 0 0;
  height:55%;
  background:linear-gradient(180deg,rgba(8,26,46,0),rgba(8,26,46,.72));
  pointer-events:none;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--slant{clip-path:polygon(0 0,100% 4%,100% 100%,0 96%)}
.media-frame__tag{
  position:absolute;
  left:14px;
  bottom:14px;
  z-index:2;
  padding:5px 12px;
  border-radius:999px;
  background:var(--cyan);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  text-transform:uppercase;
}

/* ===== 面包屑 ===== */
.breadcrumbs{padding-block:14px}
.breadcrumbs__list{display:flex;flex-wrap:wrap;gap:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--steel)}
.breadcrumbs__item+.breadcrumbs__item::before{content:"/";margin-right:8px;color:rgba(201,216,228,.4)}
.breadcrumbs__item a{color:var(--mist);transition:color .16s ease}
.breadcrumbs__item a:hover{color:var(--cyan)}
.breadcrumbs__item[aria-current="page"]{color:var(--cyan)}

/* ===== 页头 ===== */
.site-header{
  position:relative;
  z-index:60;
  background:var(--ink);
  border-bottom:1px solid var(--line);
}
.scroll-progress{
  position:fixed;
  top:0;left:0;
  width:100%;height:3px;
  transform:scaleX(0);
  transform-origin:left center;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  z-index:120;
  pointer-events:none;
}
.skip-link{
  position:absolute;
  left:var(--gutter);
  top:-64px;
  z-index:130;
  padding:10px 18px;
  background:var(--cyan);
  color:var(--ink);
  font-weight:700;
  font-size:14px;
  border-radius:0 0 12px 12px;
  transition:top .18s ease;
}
.skip-link:focus{top:0}

.header-strip{
  background:linear-gradient(90deg,var(--ink-2),var(--ink) 65%);
  border-bottom:1px solid var(--line);
}
.header-strip__inner{
  max-width:var(--maxw);
  margin-inline:auto;
  padding:8px var(--gutter);
  display:flex;
  justify-content:space-between;
  gap:16px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--steel);
}
.dot::before{
  content:"";
  display:inline-block;
  width:6px;height:6px;
  margin-right:8px;
  border-radius:50%;
  background:var(--cyan);
  vertical-align:middle;
  box-shadow:0 0 10px rgba(45,245,212,.7);
}

.masthead{
  position:relative;
  max-width:var(--maxw);
  margin-inline:auto;
  padding:clamp(18px,3vw,32px) var(--gutter) clamp(14px,2.2vw,22px);
  display:flex;
  justify-content:center;
}
.masthead::after{
  content:"";
  position:absolute;
  left:var(--gutter);right:var(--gutter);bottom:0;
  height:2px;
  background:linear-gradient(90deg,var(--cyan) 0 20%,var(--orange) 20% 31%,var(--line) 31% 100%);
}
.masthead__brand{display:inline-flex;flex-direction:column;align-items:center;gap:6px}
.brand-name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(2rem,4.6vw,3.4rem);
  line-height:1;
  letter-spacing:-.05em;
  color:var(--warm);
}
.brand-name__cut{color:var(--cyan)}
.brand-sub{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.42em;
  text-indent:.42em;
  text-transform:uppercase;
  color:var(--steel);
}

.header-bar{
  position:relative;
  max-width:var(--maxw);
  margin-inline:auto;
  padding:0 var(--gutter) clamp(12px,2vw,18px);
  display:flex;
  align-items:center;
  justify-content:center;
}
.site-nav{display:flex;justify-content:center}
.nav-list{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:clamp(10px,2.2vw,30px)}
.nav-link{
  position:relative;
  display:inline-block;
  padding:10px 2px;
  font-size:14px;
  letter-spacing:.08em;
  color:var(--mist);
  transition:color .18s ease;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:4px;
  height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .18s ease;
}
.nav-link:hover,.nav-link:focus-visible{color:var(--warm)}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--cyan)}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--orange)}

.header-cta{position:absolute;right:var(--gutter);top:0}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:9px 14px;
  border:1px solid var(--line-strong);
  border-radius:999px;
  color:var(--warm);
  cursor:pointer;
}
.nav-toggle__bars{position:relative;display:block;width:18px;height:2px;background:var(--cyan);transition:background-color .16s ease}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";
  position:absolute;left:0;
  width:18px;height:2px;
  background:var(--cyan);
  transition:transform .18s ease;
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg)}
.nav-toggle__text{font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--steel)}

/* ===== 页脚 ===== */
.site-footer{
  position:relative;
  background:linear-gradient(180deg,var(--ink) 0%,var(--ink-2) 45%,var(--ink-3) 100%);
  border-top:1px solid rgba(45,245,212,.32);
  color:var(--warm);
  padding-block:clamp(40px,6vw,72px) clamp(24px,3vw,36px);
  background-image:radial-gradient(circle at 88% 0%,rgba(45,245,212,.1),transparent 52%),radial-gradient(circle at 4% 92%,rgba(255,107,44,.08),transparent 46%);
}
.footer-top{
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
  display:grid;
  grid-template-columns:1.5fr .8fr .8fr 1.25fr;
  gap:clamp(24px,3vw,48px);
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:16px}
.footer-lockup{
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(1.6rem,3vw,2.2rem);
  letter-spacing:-.04em;
  line-height:1;
}
.footer-note{font-size:14px;line-height:1.7;color:var(--steel);max-width:34ch}
.footer-note--small{font-size:12.5px;max-width:32ch}

.footer-col__title{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--steel);
  padding-left:10px;
  border-left:3px solid var(--orange);
  margin-bottom:14px;
}
.footer-links a{
  display:block;
  padding:6px 0;
  font-size:14px;
  color:var(--mist);
  transition:color .16s ease,transform .16s ease;
}
.footer-links a:hover{color:var(--cyan);transform:translateX(3px)}

.footer-contact{display:grid;gap:10px}
.contact-row{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px}
.contact-row__label{
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--steel);
}
.contact-row__value{font-size:14px;color:var(--warm);overflow-wrap:anywhere}
.copy-btn{
  padding:3px 10px;
  border:1px solid var(--line);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.12em;
  color:var(--mist);
  cursor:pointer;
  transition:color .16s ease,border-color .16s ease;
}
.copy-btn:hover{border-color:var(--cyan);color:var(--cyan)}
.copy-btn.is-copied{border-color:var(--signal);color:var(--signal)}

.footer-bottom{
  max-width:var(--maxw);
  margin:clamp(28px,4vw,44px) auto 0;
  padding:18px var(--gutter) 0;
  border-top:1px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  align-items:center;
  gap:12px;
}
.footer-legal{font-size:12.5px;color:var(--steel);letter-spacing:.02em}
.footer-legal a{color:var(--mist);border-bottom:1px solid rgba(201,216,228,.28)}
.footer-legal a:hover{color:var(--cyan);border-color:var(--cyan)}
.footer-icp{font-size:11px;letter-spacing:.14em;color:var(--steel)}

/* ===== 动效支持 / 工具 ===== */
.reveal-ready [data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .24s ease,transform .24s ease}
.reveal-ready [data-reveal].is-visible{opacity:1;transform:none}
[data-filter-item].is-hidden{display:none}
.filter-bar{display:flex;flex-wrap:wrap;gap:10px}
.filter-btn{
  padding:8px 15px;
  border:1px solid var(--line);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--mist);
  cursor:pointer;
  transition:color .16s ease,border-color .16s ease,background-color .16s ease;
}
.filter-btn:hover{border-color:var(--cyan);color:var(--cyan)}
.filter-btn[aria-pressed="true"]{background:var(--cyan);border-color:var(--cyan);color:var(--ink)}
.to-top{
  position:fixed;
  right:18px;bottom:18px;
  z-index:100;
  width:44px;height:44px;
  display:grid;place-items:center;
  border:1px solid var(--line-strong);
  border-radius:50%;
  background:var(--ink-2);
  color:var(--cyan);
  font-family:var(--font-mono);
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(8px);
  transition:opacity .18s ease,transform .18s ease,visibility .18s ease;
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none}

/* ===== 平板 ===== */
@media (max-width:1080px){
  .footer-top{grid-template-columns:1.3fr 1fr 1fr;gap:clamp(20px,3vw,32px)}
  .footer-col--contact{grid-column:1 / -1}
  .split,.split--reverse{grid-template-columns:minmax(0,1fr)}
  .lift-1,.lift-2{margin-top:0}
}

/* ===== 移动导航与移动布局 ===== */
@media (max-width:900px){
  body{padding-bottom:78px}
  .header-strip__inner{font-size:10px;letter-spacing:.14em}
  .masthead{padding-top:14px}
  .brand-name{font-size:clamp(1.8rem,7vw,2.4rem)}
  .brand-sub{font-size:10px;letter-spacing:.3em;text-indent:.3em}
  .header-bar{justify-content:flex-start;align-items:center;padding-bottom:10px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;
    left:0;right:0;top:100%;
    z-index:80;
    padding:6px var(--gutter) 22px;
    background:var(--ink-2);
    border-top:1px solid var(--line);
    border-bottom:2px solid var(--cyan);
    opacity:0;
    visibility:hidden;
    transform:translateY(-8px);
    transition:opacity .18s ease,transform .18s ease,visibility .18s ease;
    box-shadow:0 22px 40px rgba(0,0,0,.45);
  }
  .site-nav[data-open="true"]{opacity:1;visibility:visible;transform:none}
  .nav-list{display:grid;gap:0;justify-content:stretch}
  .nav-link{
    display:block;
    width:100%;
    padding:14px 0;
    font-size:16px;
    border-bottom:1px solid var(--line);
  }
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{color:var(--ink);background:var(--cyan);padding-inline:12px;border-radius:8px;border-color:transparent}
  .header-cta{
    position:fixed;
    left:16px;right:16px;bottom:14px;
    top:auto;
    justify-content:center;
    padding:15px 20px;
    font-size:15px;
    z-index:110;
    box-shadow:0 10px 30px rgba(45,245,212,.28),0 0 0 1px rgba(8,26,46,.2);
  }
  .to-top{bottom:84px}
  .site-footer{padding-bottom:96px}
}

@media (max-width:720px){
  body{font-size:16px}
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .footer-top{grid-template-columns:1fr;gap:26px}
  .footer-brand{gap:12px}
  .footer-note,.footer-note--small{max-width:44ch}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .media-frame{border-radius:14px}
}

@media (max-width:420px){
  .header-strip__inner span:last-child{display:none}
  .nav-toggle__text{display:none}
}

/* ===== 无障碍：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;
  }
  .reveal-ready [data-reveal]{opacity:1;transform:none}
  .btn:hover,.panel-hover:hover,.footer-links a:hover{transform:none}
  .btn:hover .btn__arrow{transform:none}
  .to-top{transform:none}
}