/* ==========================================================================
   猛犸体育登录 · 共享样式 /assets/site.css
   极地战术指挥中心：深蓝冰面、等宽索引、斜向切割、橙色焦点
   ========================================================================== */

:root{
  --ice:#0B1E33;
  --ink:#061420;
  --steel:#1B3550;
  --frost:#F2F6FA;
  --lava:#FF5A1F;
  --lava-deep:#D8440F;
  --ember:#FF8A3D;
  --turf:#2FBF71;
  --turf-deep:#1E8A50;
  --electric:#35E0D0;
  --silver:#A7B4C2;
  --violet:#5B4BD6;
  --ivory:#E8DCC8;

  --line:rgba(167,180,194,.22);
  --line-soft:rgba(167,180,194,.12);
  --line-strong:rgba(167,180,194,.42);

  --font-head:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:var(--font-head);
  --font-mono:"JetBrains Mono","SFMono-Regular",ui-monospace,Menlo,Consolas,"Liberation Mono",monospace;

  --wrap:1440px;
  --gutter:clamp(18px,4.6vw,64px);
  --header-h:96px;
  --header-h-sm:58px;
  --radius:2px;
  --measure:38em;
}

/* -------- reset -------- */
*,*::before,*::after{box-sizing:border-box;}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}
body{
  margin:0;
  background:var(--ice);
  color:var(--frost);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img,picture,svg,video,canvas{display:block;max-width:100%;}
button,input,select,textarea{font:inherit;color:inherit;}
:focus-visible{
  outline:2px solid var(--lava);
  outline-offset:3px;
  border-radius:2px;
}
::selection{background:var(--lava);color:#fff;}

/* -------- 中文排版 -------- */
h1,h2,h3,h4,h5,h6{
  margin:0;
  font-family:var(--font-head);
  font-weight:900;
  letter-spacing:-.02em;
  line-height:1.12;
  color:var(--frost);
}
h1{font-size:clamp(32px,5.2vw,64px);}
h2{font-size:clamp(24px,3vw,40px);}
h3{font-size:clamp(19px,2.1vw,28px);}
h4{font-size:20px;font-weight:800;letter-spacing:0;}
p{margin:0 0 1.1em;}
p:last-child{margin-bottom:0;}
a{color:var(--ember);text-decoration:none;}
a:hover{color:var(--lava);}
ul,ol{margin:0 0 1.1em;padding-left:1.2em;}
strong{font-weight:800;}
.mono{font-family:var(--font-mono);}

/* -------- 布局容器 -------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--gutter);
}
.wrap--narrow{max-width:1000px;}
.section{padding:clamp(48px,7vw,110px) 0;}
.section--tight{padding:clamp(32px,4vw,64px) 0;}
.section--paper{background:var(--frost);color:var(--ice);}
.section--paper h1,.section--paper h2,.section--paper h3,.section--paper h4{color:var(--ice);}
.section--deep{background:var(--ink);}
.prose{max-width:var(--measure);}
.section--paper .prose{color:#22384f;}
.divide{height:1px;background:var(--line);border:0;margin:0;}

.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(14px,1.8vw,26px);
}
.col-3{grid-column:span 3;}
.col-4{grid-column:span 4;}
.col-5{grid-column:span 5;}
.col-6{grid-column:span 6;}
.col-7{grid-column:span 7;}
.col-8{grid-column:span 8;}
.col-12{grid-column:span 12;}

/* -------- 斜切与纹理 -------- */
.slant-top{clip-path:polygon(0 clamp(16px,3vw,46px),100% 0,100% 100%,0 100%);}
.slant-both{clip-path:polygon(0 clamp(16px,3vw,46px),100% 0,100% calc(100% - clamp(16px,3vw,46px)),0 100%);}
.texture-ivory{
  background-image:repeating-linear-gradient(45deg,rgba(232,220,200,.08) 0 1px,transparent 1px 7px);
}

/* -------- 图片容器（页面阶段直接放入 img） -------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(148deg,var(--steel) 0%,var(--ink) 100%);
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:repeating-linear-gradient(45deg,rgba(232,220,200,.07) 0 1px,transparent 1px 6px);
}
.media > img,.media > picture > img{width:100%;height:100%;object-fit:cover;}
.media--16x9{aspect-ratio:16/9;}
.media--4x3{aspect-ratio:4/3;}
.media--1x1{aspect-ratio:1/1;}
.media--21x9{aspect-ratio:21/9;}
.media__label{
  position:absolute;
  left:0;
  bottom:0;
  z-index:2;
  padding:6px 12px;
  background:var(--ink);
  color:var(--silver);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
}

/* -------- 标签与注释 -------- */
.index-label{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--silver);
}
.note{
  font-size:13px;
  font-style:italic;
  color:var(--silver);
  line-height:1.7;
}
.section--paper .note,.section--paper .index-label{color:#4a5f76;}
.tag{
  display:inline-flex;
  align-items:center;
  min-height:24px;
  padding:2px 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--ice);
  background:var(--ember);
  border-radius:1px;
}
.tag--cool{background:var(--steel);color:var(--frost);}
.tag--live{background:var(--lava);color:#fff;}

/* -------- 章节编号 -------- */
.chapter-no{
  display:inline-block;
  padding:2px 6px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.08em;
  color:var(--lava);
  background:transparent;
  border-radius:1px;
  transition:background-color .18s ease,color .18s ease;
}
.section--paper .chapter-no{color:var(--lava-deep);}

/* -------- 数据面板 -------- */
.panel{
  position:relative;
  padding:clamp(18px,2.2vw,30px);
  background:var(--steel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  transition:transform .18s ease,border-color .18s ease,background-color .18s ease;
}
.panel--deep{background:var(--ink);}
.panel--paper{background:var(--frost);color:var(--ice);border-color:rgba(11,30,51,.14);}
.panel--paper h2,.panel--paper h3,.panel--paper h4{color:var(--ice);}
.panel--interactive:hover,
.panel--interactive:focus-within{
  transform:translateY(-4px);
  border-color:var(--line-strong);
}
.panel--interactive:hover .chapter-no,
.panel--interactive:focus-within .chapter-no{
  background:var(--lava);
  color:#fff;
}

/* -------- 数据数字 -------- */
.stat__label{
  display:block;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--silver);
}
.stat__value{
  display:block;
  margin-top:.22em;
  font-family:var(--font-mono);
  font-weight:700;
  font-size:clamp(40px,5.4vw,64px);
  line-height:1;
  letter-spacing:-.02em;
  font-variant-numeric:tabular-nums;
  color:var(--frost);
}
.stat__value--xl{font-size:clamp(64px,10vw,96px);}
.stat__note{
  margin-top:1.75em;
  font-size:13px;
  font-style:italic;
  color:var(--silver);
  line-height:1.7;
}
.section--paper .stat__value,.panel--paper .stat__value{color:var(--ice);}
.section--paper .stat__label,.section--paper .stat__note,
.panel--paper .stat__label,.panel--paper .stat__note{color:#4a5f76;}

/* -------- 按钮 -------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  min-height:44px;
  padding:10px 22px;
  font-family:var(--font-head);
  font-size:15px;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--frost);
  background:transparent;
  border:1px solid var(--lava);
  border-radius:var(--radius);
  cursor:pointer;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn:hover,.btn:focus-visible{
  background:var(--lava);
  border-color:var(--lava);
  color:#fff;
  transform:translateY(-1px);
}
.btn--solid{background:var(--lava);border-color:var(--lava);color:#fff;}
.btn--solid:hover,.btn--solid:focus-visible{background:var(--ember);border-color:var(--ember);}
.btn--quiet{border-color:var(--line-strong);color:var(--silver);}
.btn--quiet:hover,.btn--quiet:focus-visible{background:transparent;border-color:var(--lava);color:var(--lava);}

/* -------- 面包屑 -------- */
.breadcrumb{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--silver);
}
.breadcrumb ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
}
.breadcrumb li{display:inline-flex;align-items:center;gap:8px;}
.breadcrumb li + li::before{content:"/";color:var(--line-strong);}
.breadcrumb a{color:var(--silver);}
.breadcrumb a:hover,.breadcrumb a:focus-visible{color:var(--lava);}

/* -------- 跳至主要内容 -------- */
.skip-link{
  position:absolute;
  top:10px;
  left:var(--gutter);
  z-index:120;
  padding:10px 18px;
  background:var(--lava);
  color:#fff;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.04em;
  text-decoration:none;
  transform:translateY(-220%);
  transition:transform .18s ease;
}
.skip-link:focus,.skip-link:focus-visible{
  transform:translateY(0);
  color:#fff;
  outline-offset:2px;
}

/* ==========================================================================
   头部
   ========================================================================== */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:var(--ink);
  color:var(--frost);
  border-bottom:1px solid var(--line);
}
.site-header__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:clamp(16px,3vw,44px);
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--gutter);
  min-height:var(--header-h);
  transition:min-height .2s ease;
}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:14px;
  flex:0 0 auto;
  min-height:44px;
  color:var(--frost);
  text-decoration:none;
}
.brand__mark{
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(18px,2vw,21px);
  letter-spacing:-.02em;
  white-space:nowrap;
  transition:color .18s ease;
}
.brand:hover .brand__mark,.brand:focus-visible .brand__mark{color:var(--ember);}
.brand__rule{
  width:2px;
  height:20px;
  flex:0 0 auto;
  opacity:.72;
  background-image:repeating-linear-gradient(0deg,var(--ivory) 0 2px,transparent 2px 5px);
}
.brand__tag{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--silver);
  white-space:nowrap;
  transition:opacity .18s ease;
}

/* 导航 */
.site-nav{
  display:flex;
  align-items:center;
  margin-left:auto;
  min-width:0;
}
.site-nav__list{
  display:flex;
  align-items:center;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
}
.site-nav__item{display:flex;}
.site-nav__link{
  position:relative;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 10px;
  font-family:var(--font-head);
  font-size:15px;
  font-weight:700;
  letter-spacing:.01em;
  color:var(--silver);
  text-decoration:none;
  white-space:nowrap;
  transition:color .18s ease;
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:10px;
  right:10px;
  bottom:11px;
  height:2px;
  background:var(--lava);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .2s ease;
}
.site-nav__link:hover,.site-nav__link:focus-visible{color:var(--frost);}
.site-nav__link:hover::after,.site-nav__link:focus-visible::after{transform:scaleX(1);}
.site-nav__link[aria-current="page"]{color:var(--frost);}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1);}
.site-nav__cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  margin-left:14px;
  padding:8px 20px;
  border:1px solid var(--lava);
  border-radius:var(--radius);
  color:var(--frost);
  font-family:var(--font-head);
  font-size:14px;
  font-weight:700;
  letter-spacing:.02em;
  text-decoration:none;
  white-space:nowrap;
  transition:background-color .18s ease,color .18s ease,transform .18s ease;
}
.site-nav__cta:hover,.site-nav__cta:focus-visible{
  background:var(--lava);
  color:#fff;
  transform:translateY(-1px);
}

/* 移动导航按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  min-width:44px;
  min-height:44px;
  padding:8px 14px;
  background:transparent;
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  color:var(--frost);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  cursor:pointer;
}
.nav-toggle:hover,.nav-toggle:focus-visible{border-color:var(--lava);}
.nav-toggle__bars{
  display:inline-flex;
  flex-direction:column;
  justify-content:center;
  gap:3px;
  width:16px;
}
.nav-toggle__bars i{
  display:block;
  height:2px;
  background:var(--lava);
  transition:transform .18s ease,opacity .18s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg);}

/* 滚动进度 */
.scroll-meter{
  width:100%;
  height:2px;
  background:transparent;
}
.scroll-meter__bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--lava) 0%,var(--ember) 100%);
  transition:width .12s linear;
}

/* 压缩态 */
.site-header.is-condensed .site-header__inner{min-height:var(--header-h-sm);}
.site-header.is-condensed .site-nav__link{
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.06em;
}
.site-header.is-condensed .brand__tag{opacity:.5;}
.site-header.is-condensed .site-nav__link::after{bottom:9px;}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer{
  padding:clamp(40px,5vw,72px) 0 28px;
  background:var(--ink);
  color:var(--silver);
  border-top:1px solid var(--line);
  font-size:14px;
}
.site-footer__inner{
  width:100%;
  max-width:var(--wrap);
  margin:0 auto;
  padding:0 var(--gutter);
}
.site-footer__top{
  display:grid;
  grid-template-columns:minmax(200px,1fr) 2.2fr;
  gap:clamp(28px,4vw,64px);
  padding-bottom:clamp(26px,3.2vw,46px);
  border-bottom:1px solid var(--line-soft);
}
.site-footer__brand{display:block;}
.site-footer__mark{
  display:inline-block;
  font-family:var(--font-head);
  font-weight:900;
  font-size:20px;
  letter-spacing:-.02em;
  color:var(--frost);
  text-decoration:none;
  transition:color .18s ease;
}
.site-footer__mark:hover,.site-footer__mark:focus-visible{color:var(--ember);}
.site-footer__motto{
  margin:12px 0 0;
  max-width:22em;
  font-size:13px;
  font-style:italic;
  color:var(--silver);
}
.site-footer__nav{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(18px,2.6vw,40px);
}
.footer-col__title{
  margin:0 0 6px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--frost);
}
.footer-col__list{
  display:flex;
  flex-direction:column;
  gap:0;
  margin:0;
  padding:0;
  list-style:none;
}
.footer-col__list--plain{gap:2px;}
.footer-link{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 2px;
  color:var(--silver);
  font-size:14px;
  text-decoration:none;
  transition:color .18s ease;
}
.footer-link:hover,.footer-link:focus-visible{color:var(--lava);}
.footer-link--inline{
  min-height:36px;
  padding:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  text-decoration:underline;
  text-underline-offset:3px;
}
.footer-note{
  display:block;
  padding:2px 0;
  font-size:13px;
  line-height:1.65;
  color:var(--silver);
}
.site-footer__contact{
  padding:20px 0;
  border-bottom:1px solid var(--line-soft);
}
.footer-contact{
  margin:0;
  font-size:13px;
  line-height:1.85;
  color:var(--silver);
}
.site-footer__legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:4px 22px;
  padding-top:18px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
}
.site-footer__legal .footer-note{font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;}

/* ==========================================================================
   入场落定
   ========================================================================== */
[data-reveal]{transition:opacity .45s ease,transform .45s ease;}
html.has-js [data-reveal]:not(.is-revealed){opacity:0;transform:translateY(10px);}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width:1024px){
  .site-header__inner{gap:16px;}
  .nav-toggle{display:inline-flex;}

  .site-nav{
    position:fixed;
    left:0;
    right:0;
    bottom:0;
    z-index:80;
    display:block;
    margin:0;
    max-height:84vh;
    overflow-y:auto;
    padding:20px var(--gutter) calc(24px + env(safe-area-inset-bottom));
    background:var(--ink);
    border-top:1px solid var(--line-strong);
    clip-path:polygon(0 14px,100% 0,100% 100%,0 100%);
    transform:translateY(102%);
    visibility:hidden;
    transition:transform .26s cubic-bezier(.2,.7,.3,1),visibility .26s;
  }
  .site-nav[data-open]{
    transform:translateY(0);
    visibility:visible;
  }
  .site-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .site-nav__item{display:block;}
  .site-nav__item--cta{display:block;}
  .site-nav__link{
    justify-content:flex-start;
    width:100%;
    min-height:56px;
    padding:0 4px;
    font-family:var(--font-head);
    font-size:17px;
    font-weight:700;
    letter-spacing:0;
    color:var(--frost);
    border-bottom:1px solid var(--line-soft);
  }
  .site-nav__link::before{
    content:attr(data-index);
    flex:0 0 auto;
    margin-right:16px;
    font-family:var(--font-mono);
    font-size:11px;
    font-weight:600;
    letter-spacing:.08em;
    color:var(--silver);
    transition:color .18s ease;
  }
  .site-nav__link::after{display:none;}
  .site-nav__link[aria-current="page"]{color:var(--lava);}
  .site-nav__link[aria-current="page"]::before{color:var(--lava);}
  .site-nav__cta{
    width:100%;
    min-height:52px;
    margin:20px 0 0;
  }
  .site-header.is-condensed .site-nav__link{
    font-family:var(--font-head);
    font-size:17px;
    letter-spacing:0;
  }

  .site-footer__top{grid-template-columns:1fr;}
  .site-footer__nav{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:840px){
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr));}
  .col-3,.col-4{grid-column:span 3;}
  .col-5,.col-6,.col-7{grid-column:span 6;}
  .col-8{grid-column:span 6;}
}

@media (max-width:560px){
  :root{--header-h:72px;}
  .brand__tag{display:none;}
  .nav-toggle__label{display:none;}
  .nav-toggle{padding:10px 12px;}
  .brand__rule{height:18px;}
  .grid-12{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-12{grid-column:span 2;}
  .site-footer__nav{grid-template-columns:1fr;}
  .site-footer__legal{gap:2px 16px;}
}

/* ==========================================================================
   减少动效
   ========================================================================== */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  html{scroll-behavior:auto;}
  html.has-js [data-reveal]:not(.is-revealed){opacity:1;transform:none;}
  .panel--interactive:hover,.panel--interactive:focus-within{transform:none;}
  .btn:hover,.btn:focus-visible,.site-nav__cta:hover,.site-nav__cta:focus-visible{transform:none;}
}