/* ============ B体育入口 全站共享样式 ============ */
:root{
  --color-bg:#0A1A2F;
  --color-bg-secondary:#0F3A4D;
  --color-accent:#C6FF00;
  --color-accent-orange:#FF6B00;
  --color-wine:#6B2737;
  --color-indigo:#3D2E8C;
  --color-text:#F2F6FC;
  --color-text-secondary:#A8B8C8;
  --color-grid:#1F3A4D;
  --color-card:#112233;
  --font-headline:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-number:"Roboto Mono","SFMono-Regular","Consolas",monospace;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --header-h:64px;
  --rail-w:300px;
}

/* ============ Reset 与基础 ============ */
*,
*::before,
*::after{
  box-sizing:border-box;
  margin:0;
  padding:0;
}

html{
  scroll-behavior:smooth;
}

body{
  background:
    linear-gradient(135deg, rgba(61,46,140,.12) 0%, transparent 34%),
    var(--color-bg);
  color:var(--color-text);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  min-height:100vh;
}

h1,h2,h3{
  font-family:var(--font-headline);
  font-weight:900;
  line-height:1.2;
  color:var(--color-text);
  text-wrap:balance;
}

h1{
  font-size:clamp(2.6rem, 5vw, 4.2rem);
}

h2{
  font-size:clamp(1.7rem, 3vw, 2.4rem);
}

h3{
  font-size:1.25rem;
}

p{
  margin-bottom:1em;
}

a{
  color:var(--color-accent);
  text-decoration:none;
}

a:hover{
  text-decoration:underline;
}

ul,ol{
  list-style:none;
}

button{
  font:inherit;
  background:none;
  border:none;
  color:inherit;
  cursor:pointer;
}

img,svg,canvas{
  display:block;
  max-width:100%;
}

::selection{
  background:var(--color-accent);
  color:var(--color-bg);
}

[hidden]{
  display:none !important;
}

:focus-visible{
  outline:2px solid var(--color-accent);
  outline-offset:3px;
}

/* ============ 跳转链接 ============ */
.skip-link{
  position:fixed;
  left:16px;
  top:-80px;
  z-index:100;
  background:var(--color-accent);
  color:var(--color-bg);
  padding:10px 18px;
  font-weight:700;
  border:1px solid var(--color-bg);
}

.skip-link:focus{
  top:12px;
  text-decoration:none;
}

/* ============ 头部 ============ */
.site-header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:var(--header-h);
  z-index:40;
  background:rgba(10,26,47,.92);
  border-bottom:1px solid var(--color-grid);
  display:flex;
  align-items:center;
}

.site-header__inner{
  width:100%;
  max-width:1280px;
  margin:0 auto;
  padding:0 16px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
}

/* ============ 品牌 ============ */
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  color:var(--color-text);
}

.brand:hover{
  text-decoration:none;
}

.brand__mark{
  width:42px;
  height:42px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  background:var(--color-accent);
  color:var(--color-bg);
  font-family:var(--font-number);
  font-weight:900;
  font-size:24px;
  clip-path:polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
  flex:none;
}

.brand__text{
  display:flex;
  flex-direction:column;
  line-height:1.2;
}

.brand__name{
  font-weight:900;
  font-size:22px;
  letter-spacing:.02em;
}

.brand__caption{
  font-size:11px;
  font-family:var(--font-number);
  color:var(--color-text-secondary);
  letter-spacing:.14em;
  margin-top:2px;
}

.brand__mark--sm{
  width:32px;
  height:32px;
  font-size:18px;
}

/* ============ 移动导航按钮 ============ */
.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px;
  color:var(--color-text);
}

.nav-toggle__box{
  display:block;
  width:24px;
}

.nav-toggle__line{
  display:block;
  width:22px;
  height:2px;
  margin:4px 0;
  background:currentColor;
  transition:transform .25s ease, opacity .25s ease;
}

.nav-toggle__label{
  font-size:12px;
  font-family:var(--font-number);
  letter-spacing:.1em;
}

.site-header[data-open="true"] .nav-toggle__line:nth-child(1){
  transform:translateY(6px) rotate(45deg);
}

.site-header[data-open="true"] .nav-toggle__line:nth-child(2){
  opacity:0;
}

.site-header[data-open="true"] .nav-toggle__line:nth-child(3){
  transform:translateY(-6px) rotate(-45deg);
}

/* ============ 导航面板 ============ */
.site-nav{
  background:var(--color-bg);
}

.site-nav__list{
  counter-reset:nav-item;
}

.site-nav__item{
  counter-increment:nav-item;
}

.site-nav__link{
  display:flex;
  align-items:center;
  gap:14px;
  padding:13px 16px;
  color:var(--color-text);
  font-weight:500;
  font-size:16px;
  border-left:2px solid transparent;
  transition:background .2s ease, color .2s ease, border-color .2s ease;
}

.site-nav__link::before{
  content:counter(nav-item, decimal-leading-zero);
  counter-increment:none;
  font-family:var(--font-number);
  font-size:12px;
  color:var(--color-text-secondary);
  min-width:24px;
  letter-spacing:.05em;
}

.site-nav__link:hover{
  background:rgba(198,255,0,.07);
  border-left-color:var(--color-accent);
  color:var(--color-accent);
  text-decoration:none;
}

.site-nav__link[aria-current="page"]{
  background:linear-gradient(90deg, rgba(107,39,55,.52), transparent 82%);
  border-left-color:var(--color-accent-orange);
  color:var(--color-text);
}

.site-nav__link[aria-current="page"]::before{
  color:var(--color-accent-orange);
}

.site-nav__status{
  display:flex;
  align-items:center;
  gap:10px;
  padding:16px;
  border-top:1px solid var(--color-grid);
  font-size:12px;
  color:var(--color-text-secondary);
  font-family:var(--font-number);
}

/* ============ 系统状态 ============ */
.sys-status{
  display:flex;
  align-items:center;
  gap:10px;
  font-size:12px;
  font-family:var(--font-number);
  color:var(--color-text-secondary);
}

.sys-status__dot{
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--color-accent);
  box-shadow:0 0 10px var(--color-accent);
  animation:sys-pulse 2.4s ease-in-out infinite;
}

.sys-status__text{
  letter-spacing:.06em;
}

@keyframes sys-pulse{
  0%,100%{ opacity:1; transform:scale(1); }
  50%{ opacity:.55; transform:scale(.85); }
}

/* ============ 遮罩与进度条 ============ */
.nav-overlay{
  position:fixed;
  inset:0;
  z-index:39;
  background:rgba(4,10,20,.6);
  opacity:0;
  visibility:hidden;
  pointer-events:none;
  transition:opacity .3s ease, visibility .3s ease;
}

.nav-overlay.is-open{
  opacity:1;
  visibility:visible;
  pointer-events:auto;
}

.stream-progress{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:4px;
  z-index:70;
  pointer-events:none;
}

.stream-progress__bar{
  display:block;
  width:0%;
  height:100%;
  background:linear-gradient(90deg, var(--color-accent) 0 70%, var(--color-accent-orange) 70%);
  transition:width .1s linear;
}

/* ============ 移动端导航抽屉 ============ */
@media (max-width:1023px){
  .brand__caption{
    display:none;
  }

  .site-nav{
    position:fixed;
    top:var(--header-h);
    left:0;
    bottom:0;
    width:min(340px, 86vw);
    z-index:45;
    display:flex;
    flex-direction:column;
    padding:24px 0 0;
    overflow-y:auto;
    box-shadow:6px 0 24px rgba(0,0,0,.35);
    transform:translateX(-110%);
    transition:transform .3s ease;
  }

  .site-header[data-open="true"] .site-nav{
    transform:translateX(0);
  }

  .site-nav__status{
    margin-top:auto;
  }

  .site-nav::-webkit-scrollbar{
    width:4px;
  }

  .site-nav::-webkit-scrollbar-thumb{
    background:var(--color-grid);
  }
}

/* ============ 主内容区 ============ */
#main-content{
  position:relative;
  padding-top:calc(var(--header-h) + 8px);
}

.page-shell{
  width:100%;
  max-width:1280px;
  margin:0 auto;
  padding:24px 20px 56px;
}

/* ============ 网格 ============ */
.grid{
  display:grid;
  gap:20px;
  grid-template-columns:1fr;
}

@media (min-width:640px){
  .grid--2,
  .grid--4{
    grid-template-columns:repeat(2, 1fr);
  }

  .grid--3{
    grid-template-columns:repeat(3, 1fr);
  }
}

@media (min-width:1024px){
  .grid--2{
    grid-template-columns:repeat(2, 1fr);
  }

  .grid--3{
    grid-template-columns:repeat(3, 1fr);
  }

  .grid--4{
    grid-template-columns:repeat(4, 1fr);
  }
}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:13px 26px;
  font-family:var(--font-headline);
  font-weight:700;
  font-size:15px;
  line-height:1;
  color:var(--color-bg);
  background:var(--color-accent);
  position:relative;
  clip-path:polygon(0 0, calc(100% - 10px) 0, 100% 100%, 10px 100%);
  transition:transform .2s ease, box-shadow .2s ease, background .2s ease, color .2s ease, border-color .2s ease;
}

.btn:hover{
  text-decoration:none;
  transform:translateX(3px);
  box-shadow:4px 4px 0 rgba(255,107,0,.55);
}

.btn:active{
  transform:translate(2px, 2px);
  box-shadow:2px 2px 0 rgba(255,107,0,.55);
}

.btn--orange{
  background:var(--color-accent-orange);
}

.btn--ghost{
  background:transparent;
  color:var(--color-text);
  clip-path:none;
  border:1px solid var(--color-grid);
}

.btn--ghost:hover{
  border-color:var(--color-accent);
  color:var(--color-accent);
  box-shadow:none;
}

.btn--sm{
  padding:9px 18px;
  font-size:13px;
}

/* ============ 面包屑 ============ */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:6px;
  padding:12px 0;
  font-family:var(--font-number);
  font-size:13px;
  color:var(--color-text-secondary);
}

.breadcrumb a{
  color:var(--color-text-secondary);
}

.breadcrumb a:hover{
  color:var(--color-accent);
}

.breadcrumb__sep{
  opacity:.6;
}

.breadcrumb__item[aria-current="page"]{
  color:var(--color-accent);
}

/* ============ 区块标题 ============ */
.section-label{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-number);
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--color-accent);
}

.section-label::before{
  content:'';
  width:28px;
  height:2px;
  background:var(--color-accent);
}

.section-title{
  margin-top:8px;
  font-size:clamp(2rem, 5vw, 3.5rem);
}

/* ============ 标签 ============ */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  font-size:12px;
  font-family:var(--font-number);
  border:1px solid var(--color-grid);
  color:var(--color-text-secondary);
  white-space:nowrap;
}

.tag--green{
  color:var(--color-accent);
  border-color:rgba(198,255,0,.4);
}

.tag--orange{
  color:var(--color-accent-orange);
  border-color:rgba(255,107,0,.4);
}

.tag--wine{
  background:var(--color-wine);
  color:var(--color-text);
  border-color:var(--color-wine);
}

/* ============ 数据卡片 ============ */
.data-card{
  background:var(--color-card);
  border:1px solid var(--color-grid);
  border-top:2px solid var(--color-accent);
  padding:20px;
  position:relative;
}

.data-card__title{
  font-size:16px;
  font-weight:700;
  color:var(--color-text);
}

.data-card__meta{
  margin-top:6px;
  font-family:var(--font-number);
  font-size:12px;
  color:var(--color-text-secondary);
  line-height:1.5;
}

/* ============ 图片容器 ============ */
.image-frame{
  position:relative;
  overflow:hidden;
  background:linear-gradient(135deg, var(--color-card), var(--color-bg-secondary));
  border:1px solid var(--color-grid);
}

.image-frame::before{
  content:'';
  display:block;
  padding-top:56.25%;
}

.image-frame--tall::before{
  padding-top:120%;
}

.image-frame--square::before{
  padding-top:100%;
}

.image-frame--landscape::before{
  padding-top:42%;
}

.image-frame > img,
.image-frame > svg,
.image-frame > canvas{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
}

/* ============ 页脚 ============ */
.site-footer{
  position:relative;
  margin-top:56px;
  background:linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-secondary) 130%);
  border-top:1px solid var(--color-grid);
}

.site-footer::before{
  content:'';
  position:absolute;
  top:-1px;
  left:0;
  right:0;
  height:3px;
  background:linear-gradient(90deg, var(--color-accent) 0 36%, var(--color-wine) 36% 70%, var(--color-accent-orange) 70%);
}

.site-footer__inner{
  max-width:1280px;
  margin:0 auto;
  padding:32px 20px 24px;
}

.site-footer__grid{
  display:grid;
  gap:32px 24px;
  grid-template-columns:1fr;
  padding-bottom:28px;
  margin-bottom:22px;
  border-bottom:1px solid var(--color-grid);
}

.footer-brand{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:10px;
}

.footer-brand__name{
  font-weight:900;
  font-size:20px;
  color:var(--color-text);
}

.footer-brand__desc{
  color:var(--color-text-secondary);
  font-size:14px;
  margin:0;
}

.footer-heading{
  font-size:12px;
  letter-spacing:.16em;
  color:var(--color-accent);
  font-family:var(--font-number);
  text-transform:uppercase;
  margin-bottom:10px;
}

.footer-links__list,
.footer-contact__list{
  list-style:none;
}

.footer-links__list li + li,
.footer-contact__list li + li{
  margin-top:8px;
}

.site-footer a{
  color:var(--color-text-secondary);
  transition:color .2s ease;
}

.site-footer a:hover{
  color:var(--color-accent);
  text-decoration:none;
}

.site-footer__meta{
  display:flex;
  flex-wrap:wrap;
  gap:10px 20px;
  align-items:center;
  justify-content:space-between;
  font-family:var(--font-number);
  font-size:12px;
  color:var(--color-text-secondary);
}

.footer-copy span{
  color:var(--color-text);
}

.footer-trust{
  flex:1 0 100%;
  border-top:1px dashed var(--color-grid);
  padding-top:12px;
  margin-top:4px;
  text-align:center;
  font-family:var(--font-body);
}

/* ============ 平板与桌面断点 ============ */
@media (min-width:640px){
  .site-footer__grid{
    grid-template-columns:1.4fr 1fr 1fr;
  }
}

@media (min-width:1024px){
  .site-header{
    position:fixed;
    top:0;
    left:0;
    bottom:0;
    right:auto;
    width:var(--rail-w);
    height:100vh;
    align-items:stretch;
    background:linear-gradient(170deg, var(--color-bg) 0%, var(--color-bg-secondary) 130%);
    border-right:1px solid var(--color-grid);
    border-bottom:none;
  }

  .site-header::before{
    content:'';
    position:absolute;
    top:0;
    right:0;
    width:120px;
    height:100%;
    background:var(--color-wine);
    clip-path:polygon(100% 0, 100% 100%, 0 100%);
    opacity:.22;
    pointer-events:none;
  }

  .site-header__inner{
    max-width:none;
    width:100%;
    flex-direction:column;
    align-items:flex-start;
    justify-content:flex-start;
    gap:0;
    padding:32px 24px 16px;
  }

  .nav-toggle{
    display:none;
  }

  .site-nav{
    display:flex;
    flex-direction:column;
    flex:1;
    width:100%;
    margin-top:40px;
    padding-top:4px;
    position:static;
    transform:none;
    box-shadow:none;
    overflow:visible;
    background:transparent;
  }

  .site-nav__list{
    flex:1 1 auto;
  }

  .site-nav__link{
    padding:12px 12px;
  }

  .site-nav__status{
    padding:16px 12px;
  }

  .nav-overlay{
    display:none;
  }

  #main-content,
  .site-footer{
    margin-left:var(--rail-w);
  }

  #main-content{
    padding-top:0;
  }

  .page-shell{
    padding:48px 40px 64px;
  }
}

/* ============ 动效降级 ============ */
@media (prefers-reduced-motion: reduce){
  html{
    scroll-behavior:auto;
  }

  *,
  *::before,
  *::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    transition-delay:0s !important;
  }

  .stream-progress__bar{
    transition:none;
  }

  .site-nav{
    transition:transform .15s ease-out;
  }

  .nav-overlay{
    transition:none;
  }
}