/* ============================================================
   浩瀚体育 · 共享样式表 /assets/site.css
   深空底 + 电子青结构线 + 熔岩橙关键数值
   ============================================================ */

:root{
  --ink-900:#06121F;
  --deep-800:#0B1E33;
  --surface-700:#102A44;
  --cyan-500:#00E5FF;
  --cyan-300:#7FE3FF;
  --orange-500:#FF6B35;
  --white-000:#F2F6FA;
  --grey-400:#8A9BAE;
  --line-600:#1B3A57;
  --read-bg:#EDF1F6;
  --ok-500:#2BD9C4;
  --edge-500:#3A4F66;

  --font-sans:"Inter Tight","PingFang SC","HarmonyOS Sans","Source Han Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","SF Mono","Roboto Mono",Menlo,Consolas,monospace;

  --header-h:72px;
  --shell-w:1320px;
  --gutter:24px;
  --grid-size:24px;
  --grid-line:rgba(0,229,255,.07);

  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--ink-900);
  color:var(--white-000);
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{margin:0;font-weight:800;letter-spacing:-.02em;line-height:1.15}
p{margin:0 0 1.2em}
p:last-child{margin-bottom:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none;transition:color 200ms linear,border-color 200ms linear,background-color 200ms linear}
img,svg,video{max-width:100%;display:block}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--cyan-500);outline-offset:3px;border-radius:1px}
::selection{background:var(--cyan-500);color:var(--ink-900)}
html.nav-open{overflow:hidden}

/* ---------- 通用工具 ---------- */
.shell{width:min(var(--shell-w),100% - (var(--gutter) * 2));margin-inline:auto}
.grid-bg{
  background-image:
    linear-gradient(var(--grid-line) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);
  background-size:var(--grid-size) var(--grid-size);
}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;border:1px solid var(--line-600);border-radius:1px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--cyan-300);line-height:1.4;
}
.prose{max-width:42rem;font-size:16.5px;line-height:1.75;color:rgba(242,246,250,.9)}
.prose h2{font-size:24px;margin:2.4em 0 .8em;color:var(--white-000)}
.prose h3{font-size:18px;margin:2em 0 .6em;color:var(--cyan-300)}
.prose p{margin-bottom:1.2em}
.prose ul{margin:0 0 1.2em}
.prose li{position:relative;padding-left:20px;margin-bottom:.5em}
.prose li::before{content:"";position:absolute;left:0;top:.78em;width:8px;height:1px;background:var(--cyan-500)}
.prose strong{color:var(--white-000);font-weight:700}
.prose code{font-family:var(--font-mono);font-size:.92em;color:var(--cyan-300)}

/* 图片容器基础规则（页面阶段放入 <img>） */
.media-frame{
  position:relative;overflow:hidden;
  border:1px solid var(--line-600);border-radius:1px;
  background:var(--surface-700);
  aspect-ratio:var(--media-ratio,16 / 9);
}
.media-frame>img{width:100%;height:100%;object-fit:cover;filter:saturate(.86) contrast(1.06)}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(6,18,31,.08) 0%,rgba(6,18,31,.36) 52%,rgba(6,18,31,.78) 100%);
}
.media-frame--wide{--media-ratio:21 / 9}
.media-frame--tall{--media-ratio:3 / 4}
.media-frame--plain::after{display:none}

/* 浅底阅读模式 */
.reading{background:var(--read-bg);color:var(--deep-800)}
.reading .prose{color:#1A2C40}
.reading .prose h2,.reading .prose h3{color:var(--deep-800)}
.reading .prose strong{color:var(--deep-800)}

/* 面包屑 */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:var(--grey-400);
}
.breadcrumb a{color:var(--cyan-300)}
.breadcrumb a:hover{color:var(--cyan-500)}
.breadcrumb-sep{color:var(--edge-500)}
.breadcrumb [aria-current="page"]{color:var(--white-000)}

/* 章节目录 */
.toc{font-size:13px;line-height:1.6}
.toc-title{
  margin-bottom:12px;font-family:var(--font-mono);
  font-size:11px;letter-spacing:.14em;color:var(--cyan-300);
}
.toc a{
  display:block;padding:7px 0 7px 12px;
  border-left:1px solid var(--line-600);color:var(--grey-400);
}
.toc a:hover{color:var(--cyan-300)}
.toc a[aria-current="true"]{border-left-color:var(--cyan-500);color:var(--white-000)}

/* 主内容锚点留白 */
#main-content{padding-top:var(--header-h);scroll-margin-top:var(--header-h)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 18px;border:1px solid transparent;border-radius:1px;
  font-family:var(--font-sans);font-size:14px;font-weight:700;
  letter-spacing:.01em;line-height:1;cursor:pointer;white-space:nowrap;
  transition:background-color 200ms linear,color 200ms linear,border-color 200ms linear;
}
.btn--solid{background:var(--cyan-500);color:#04131F}
.btn--solid:hover{background:var(--cyan-300)}
.btn--ghost{border-color:var(--edge-500);color:var(--white-000)}
.btn--ghost:hover{border-color:var(--cyan-500);color:var(--cyan-500)}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;left:var(--gutter);top:-64px;z-index:200;
  padding:10px 16px;background:var(--cyan-500);color:#04131F;
  font-size:13px;font-weight:700;border-radius:1px;
  transition:top 200ms var(--ease);
}
.skip-link:focus-visible{top:12px}

/* ---------- 头部 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:120;
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background-color 240ms var(--ease),border-color 240ms var(--ease);
}
.site-header[data-scrolled="true"]{
  background:var(--deep-800);
  border-bottom-color:var(--cyan-500);
}
.header-inner{
  width:min(var(--shell-w),100% - (var(--gutter) * 2));
  margin-inline:auto;
  min-height:var(--header-h);
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:center;
  gap:12px 40px;
}

/* 品牌块 */
.brand{display:inline-flex;align-items:center;gap:12px;padding:8px 0}
.brand-mark{
  position:relative;flex:none;width:20px;height:20px;
  border:1px solid var(--cyan-500);border-radius:1px;
}
.brand-mark::before{content:"";position:absolute;left:3px;top:3px;width:6px;height:6px;background:var(--orange-500)}
.brand-mark::after{content:"";position:absolute;right:3px;bottom:4px;width:9px;height:1px;background:var(--cyan-500)}
.brand-words{display:flex;flex-direction:column;line-height:1}
.brand-name{font-size:19px;font-weight:900;letter-spacing:-.02em;color:var(--white-000)}
.brand-tag{margin-top:6px;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.06em;color:var(--grey-400);white-space:nowrap}

/* 导航 */
.site-nav{grid-column:2;justify-self:center}
.nav-list{display:flex;align-items:stretch;height:var(--header-h);counter-reset:nav}
.nav-item{display:flex}
.nav-link{
  position:relative;display:flex;align-items:center;
  padding:0 15px;font-size:13.5px;font-weight:600;letter-spacing:.01em;
  color:rgba(242,246,250,.78);
}
.nav-link:hover{color:var(--cyan-500)}
.nav-link::after{
  content:"";position:absolute;left:15px;right:15px;bottom:0;height:2px;
  background:var(--cyan-500);transform:scaleX(0);transform-origin:left;
  transition:transform 240ms var(--ease);
}
.nav-link:hover::after,
.nav-link[aria-current="page"]::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--cyan-500)}
.nav-meta{display:none}

/* 行动区 */
.header-actions{display:flex;align-items:center;gap:10px;justify-self:end}

/* 移动导航按钮 */
.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:9px 12px;border:1px solid var(--edge-500);border-radius:1px;
  background:transparent;color:var(--white-000);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;cursor:pointer;
  transition:border-color 200ms linear,color 200ms linear;
}
.nav-toggle:hover{border-color:var(--cyan-500);color:var(--cyan-500)}
.nav-toggle-bars{display:flex;flex-direction:column;justify-content:center;gap:4px;width:18px;height:12px}
.nav-toggle-bars i{display:block;height:1px;background:currentColor;transition:transform 240ms var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:first-child{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:last-child{transform:translateY(-5px) rotate(-45deg)}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:96px;
  padding:56px 0 26px;
  background:var(--deep-800);
  border-top:1px solid var(--line-600);
  color:var(--white-000);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;
  width:120px;height:1px;background:var(--orange-500);
}
.footer-grid{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.5fr);gap:56px}
.footer-brand-col{min-width:0}
.footer-summary{margin-top:20px;max-width:34rem;font-size:14.5px;line-height:1.85;color:var(--grey-400)}
.footer-note{margin-top:14px;max-width:34rem;font-size:12.5px;line-height:1.8;color:var(--edge-500)}
.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px}
.footer-col-title{
  margin-bottom:16px;
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.14em;color:var(--cyan-300);
}
.footer-links li{margin-bottom:2px}
.footer-links a{display:inline-block;padding:5px 0;font-size:14px;color:rgba(242,246,250,.82)}
.footer-links a:hover{color:var(--cyan-500)}
.footer-bottom{
  margin-top:48px;padding-top:20px;
  border-top:1px solid var(--line-600);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 32px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
}
.footer-contact{color:var(--grey-400)}
.footer-legal{color:var(--grey-400)}

/* 返回顶端 */
.to-top{
  position:fixed;right:24px;bottom:24px;z-index:110;
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 14px;border:1px solid var(--line-600);border-radius:1px;
  background:var(--surface-700);color:var(--cyan-300);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity 240ms var(--ease),transform 240ms var(--ease),
             visibility 240ms linear,border-color 200ms linear,color 200ms linear;
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--cyan-500);color:var(--cyan-500)}

/* ---------- 断点：平板与移动 ---------- */
@media (max-width:1080px){
  .header-inner{grid-template-columns:auto auto;justify-content:space-between;gap:12px}
  .header-actions{display:none}
  .nav-toggle{display:inline-flex}

  .site-nav{
    position:fixed;left:0;right:0;top:var(--header-h);bottom:0;z-index:1;
    margin:0;padding:20px var(--gutter) 32px;
    display:flex;flex-direction:column;
    background:var(--ink-900);
    border-top:1px solid var(--line-600);
    overflow-y:auto;
    opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-8px);
    transition:opacity 240ms var(--ease),transform 240ms var(--ease),visibility 240ms linear;
  }
  .site-nav[data-open="true"]{opacity:1;visibility:visible;pointer-events:auto;transform:none}

  .nav-list{flex-direction:column;align-items:stretch;height:auto}
  .nav-item{display:block}
  .nav-link{
    display:flex;align-items:baseline;gap:14px;
    padding:18px 2px;font-size:22px;font-weight:800;letter-spacing:-.01em;
    color:var(--white-000);border-bottom:1px solid var(--line-600);
  }
  .nav-link::before{
    counter-increment:nav;content:counter(nav,decimal-leading-zero);
    flex:none;font-family:var(--font-mono);font-size:11px;font-weight:500;
    letter-spacing:.08em;color:var(--cyan-500);
  }
  .nav-link::after{left:2px;right:2px;bottom:-1px}

  .nav-meta{
    display:block;margin-top:auto;padding-top:32px;
    font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--grey-400);
  }
  .nav-meta p{margin:0 0 6px}

  .footer-grid{grid-template-columns:1fr;gap:40px}
  .footer-cols{grid-template-columns:repeat(3,minmax(0,1fr))}
}

@media (max-width:640px){
  :root{--header-h:64px;--gutter:18px}
  .brand-tag{display:none}
  .brand-name{font-size:17px}
  .nav-link{font-size:19px;padding:16px 2px}
  .site-footer{margin-top:64px;padding:40px 0 22px}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px 20px}
  .footer-bottom{margin-top:32px;font-size:11.5px}
  .to-top{right:16px;bottom:16px;padding:9px 12px}
  .prose{font-size:16px}
}

/* ---------- 降低动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
}