/* ============================================================
   互博中心 / HOOBALL · 共享层
   文件：/assets/site.css
   结构：令牌 → 基础 → 通用组件 → 头部 → 页脚 → 响应式
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --deep-900:#04121F;
  --deep-700:#0A2438;
  --deep-500:#123A55;
  --cyan-400:#2BE7CE;
  --cyan-700:#0B8F84;
  --orange-500:#FF7A2F;
  --paper-100:#F6F3EA;
  --paper-300:#E4DFD2;
  --ink-900:#0E1620;
  --mist-400:#8CA3B4;

  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --shell:1200px;
  --pad:clamp(18px,4vw,48px);
  --gap:clamp(14px,2vw,28px);
  --line:1px solid var(--deep-500);
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- 2. 基础与中文排版 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background-color:var(--deep-900);
  background-image:
    linear-gradient(to right,rgba(140,163,180,.055) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(140,163,180,.055) 1px,transparent 1px);
  background-size:64px 64px;
  color:var(--paper-100);
  font-family:var(--font-body);
  font-size:16.5px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{margin:0 0 .6em;font-family:var(--font-display);font-weight:700;line-height:1.16;letter-spacing:-.02em;color:var(--paper-100)}
h1{font-size:clamp(2.2rem,5.2vw,3.5rem);font-weight:900}
h2{font-size:clamp(1.6rem,3.2vw,2.35rem)}
h3{font-size:1.15rem;letter-spacing:0;line-height:1.4}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
ul,ol{margin:0;padding:0;list-style:none}
img{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0}
a{color:var(--cyan-400);text-decoration:none;transition:color .18s var(--ease),border-color .18s var(--ease)}
a:hover{color:var(--paper-100)}
::selection{background:var(--cyan-400);color:var(--deep-900)}
:focus-visible{outline:2px solid var(--cyan-400);outline-offset:3px;border-radius:2px}

/* ---------- 3. 工具与文字 ---------- */
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}
.muted{color:var(--mist-400)}
.lede{max-width:38ch;font-size:1.06rem;line-height:1.8;color:rgba(246,243,234,.84)}
.rule{height:1px;border:0;margin:clamp(24px,4vw,44px) 0;background:linear-gradient(90deg,var(--deep-500),rgba(43,231,206,.5),transparent)}
.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

.label{
  display:inline-flex;align-items:center;gap:.5em;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;
  color:var(--cyan-400);background:rgba(43,231,206,.1);
  border:1px solid rgba(43,231,206,.38);
  padding:.28em .6em;border-radius:2px;
}
.label--paper{color:var(--ink-900);background:var(--paper-300);border-color:var(--paper-300)}
.label--accent{color:#231004;background:var(--orange-500);border-color:var(--orange-500)}
.label--ghost{color:var(--mist-400);background:transparent;border-color:var(--deep-500)}

/* ---------- 4. 布局骨架 ---------- */
.container{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--pad)}
.section{padding-block:clamp(56px,8vw,120px);position:relative}
.section--tint{background:var(--deep-700);border-block:1px solid var(--deep-500)}
.section--paper{background:var(--paper-100);color:var(--ink-900)}
.section--paper h1,.section--paper h2,.section--paper h3,.section--paper h4{color:var(--ink-900)}
.section--paper a{color:var(--cyan-700)}
.section--paper a:hover{color:var(--ink-900)}
.section--paper .muted{color:#5B6A76}
.section--paper :focus-visible{outline-color:var(--cyan-700)}
.section__head{max-width:none;margin-bottom:clamp(24px,4vw,48px)}
.eyebrow{
  display:block;margin-bottom:.9em;
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--cyan-400);
}
.section--paper .eyebrow{color:var(--cyan-700)}

.g-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap);align-items:start}
.g-main{grid-column:span 7}
.g-side{grid-column:span 4}
.g-full{grid-column:1 / -1}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:.6em 1.05em;border-radius:2px;
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.08em;
  border:1px solid var(--deep-500);color:var(--paper-100);
  background:rgba(10,36,56,.6);cursor:pointer;white-space:nowrap;
  transition:background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease),transform .18s var(--ease);
}
.btn:hover{color:var(--paper-100);text-decoration:none;border-color:var(--cyan-400);transform:translateY(-1px)}
.btn--accent{background:var(--orange-500);border-color:var(--orange-500);color:#231004;font-weight:700}
.btn--accent:hover{background:#FF8F4F;border-color:#FF8F4F;color:#231004}
.btn--line{background:transparent;border-color:rgba(43,231,206,.5);color:var(--cyan-400)}
.btn--line:hover{background:rgba(43,231,206,.1);color:var(--cyan-400);border-color:var(--cyan-400)}
.btn--quiet{background:transparent;border-color:transparent;border-bottom:1px solid rgba(43,231,206,.5);padding-inline:.2em;color:var(--cyan-400)}
.btn--quiet:hover{color:var(--paper-100);border-bottom-color:var(--paper-100)}
.section--paper .btn{background:transparent;color:var(--ink-900);border-color:var(--paper-300)}
.section--paper .btn--accent{background:var(--orange-500);border-color:var(--orange-500);color:#231004}
.btn-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:clamp(18px,2.6vw,28px)}

/* ---------- 6. 头部：居中刊头 ---------- */
.skip-link{
  position:absolute;left:clamp(12px,3vw,32px);top:-100px;z-index:120;
  padding:.7em 1.1em;background:var(--orange-500);color:#231004;
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.08em;border-radius:2px;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:12px;color:#231004}

.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(4,18,31,.94);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--deep-500);
  transition:box-shadow .18s var(--ease),background-color .18s var(--ease);
}
.site-header.is-compact{box-shadow:0 18px 32px -24px rgba(0,0,0,.9)}
.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;pointer-events:none;
  background:linear-gradient(90deg,var(--cyan-400),var(--orange-500));
  transform:scaleX(var(--progress,0));transform-origin:0 50%;
}

.masthead{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  align-items:center;gap:var(--gap);
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding:16px var(--pad) 12px;
  transition:padding .18s var(--ease);
}
.masthead__status{
  display:inline-flex;align-items:center;gap:9px;margin:0;
  font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--mist-400);
}
.dot{
  width:7px;height:7px;border-radius:50%;flex:none;
  background:var(--cyan-400);
  box-shadow:0 0 0 3px rgba(43,231,206,.16);
  animation:pulse 2.6s var(--ease) infinite;
}
@keyframes pulse{
  0%,100%{box-shadow:0 0 0 3px rgba(43,231,206,.16)}
  50%{box-shadow:0 0 0 6px rgba(43,231,206,.06)}
}
.masthead__brand{
  display:inline-flex;flex-direction:column;align-items:center;gap:2px;
  justify-self:center;text-align:center;color:var(--paper-100);
  transition:color .18s var(--ease);
}
.masthead__brand:hover{color:var(--cyan-400)}
.masthead__brand-cn{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(1.5rem,2.9vw,2.1rem);letter-spacing:-.02em;line-height:1.05;
  transition:font-size .18s var(--ease);
}
.masthead__brand-en{font-size:.6rem;letter-spacing:.42em;color:var(--mist-400);text-indent:.42em}
.masthead__meta{
  display:flex;align-items:center;justify-content:flex-end;gap:12px;min-width:0;
}
.masthead__time{
  margin:0;font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--mist-400);
  transition:opacity .18s var(--ease),visibility .18s var(--ease);
}
.masthead__actions{display:flex;align-items:center;gap:8px}
[data-header].is-compact .masthead{padding-block:7px}
[data-header].is-compact .masthead__brand-cn{font-size:1.28rem}
[data-header].is-compact .masthead__brand-en{display:none}
[data-header].is-compact .masthead__time{opacity:0;visibility:hidden}

.nav-toggle{
  display:none;align-items:center;gap:7px;
  padding:.5em .75em;border:1px solid var(--deep-500);border-radius:2px;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.12em;color:var(--paper-100);
  cursor:pointer;
}
.nav-toggle:hover{border-color:var(--cyan-400);color:var(--cyan-400)}
.nav-toggle__bars{
  width:16px;height:2px;background:currentColor;flex:none;
  box-shadow:0 -5px 0 currentColor,0 5px 0 currentColor;
}
[data-header][data-open] .nav-toggle{border-color:var(--orange-500);color:var(--orange-500)}

.site-nav{
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding:0 var(--pad);
  border-top:1px solid rgba(18,58,85,.85);
}
.site-nav__list{
  display:flex;flex-wrap:wrap;justify-content:center;align-items:center;
  gap:clamp(10px,2.2vw,32px);
  padding:6px 0 8px;
}
.site-nav__list > li{display:block}
.site-nav a{
  display:inline-flex;align-items:baseline;gap:6px;
  padding:6px 2px;
  font-size:.94rem;color:rgba(246,243,234,.8);
  border-bottom:2px solid transparent;
}
.site-nav a:hover{color:var(--cyan-400);border-bottom-color:var(--cyan-400);text-decoration:none}
.site-nav__idx{font-size:.62rem;letter-spacing:.1em;color:var(--deep-500);transition:color .18s var(--ease)}
.site-nav a:hover .site-nav__idx{color:var(--cyan-400)}
.site-nav a[aria-current="page"]{color:var(--paper-100);border-bottom-color:var(--orange-500)}
.site-nav a[aria-current="page"] .site-nav__idx{color:var(--orange-500)}
.site-nav__cta{display:none}

/* ---------- 7. 面包屑 ---------- */
.crumbs{margin-bottom:clamp(18px,2.6vw,30px)}
.crumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--mist-400)}
.crumbs li{display:inline-flex;align-items:center;gap:8px}
.crumbs li:not(:last-child)::after{content:"/";color:var(--deep-500)}
.crumbs a{color:var(--mist-400)}
.crumbs a:hover{color:var(--cyan-400)}
.crumbs [aria-current="page"]{color:var(--paper-100)}

/* ---------- 8. 卡片与数据带 ---------- */
.card{
  position:relative;padding:clamp(18px,2.4vw,30px);
  background:var(--deep-700);border:var(--line);border-radius:2px;
  transition:border-color .18s var(--ease),transform .18s var(--ease);
}
.card:hover{border-color:var(--cyan-400)}
.card--paper{
  background:var(--paper-100);color:var(--ink-900);border-color:var(--paper-300);
  box-shadow:6px 6px 0 var(--paper-300),12px 12px 0 rgba(228,223,210,.35);
}
.card--paper:hover{border-color:var(--cyan-700)}
.card__index{
  display:block;margin-bottom:.7em;
  font-family:var(--font-mono);font-size:.7rem;letter-spacing:.18em;color:var(--cyan-400);
}
.card--paper .card__index{color:var(--cyan-700)}
.card__title{margin:0 0 .5em;font-size:1.12rem}
.card--paper .card__title{color:var(--ink-900)}

.data-band{
  border-block:1px solid var(--deep-500);
  background:linear-gradient(100deg,var(--deep-700) 0%,rgba(11,143,132,.52) 55%,rgba(43,231,206,.26) 100%);
  padding-block:clamp(20px,3.2vw,34px);
}
.stat{display:flex;flex-direction:column;gap:.2em}
.stat__num{font-family:var(--font-mono);font-size:clamp(1.6rem,3.2vw,2.4rem);font-weight:700;color:var(--cyan-400);line-height:1}
.stat__label{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:rgba(246,243,234,.72)}

/* ---------- 9. 主题筛选 ---------- */
.filters{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:clamp(18px,2.6vw,28px)}
.filter-btn{
  padding:.5em .9em;border:1px solid var(--deep-500);border-radius:2px;
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.08em;
  color:var(--mist-400);cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease),background-color .18s var(--ease);
}
.filter-btn:hover{border-color:var(--cyan-400);color:var(--paper-100)}
.filter-btn[aria-pressed="true"],.filter-btn.is-active{
  background:var(--orange-500);border-color:var(--orange-500);color:#231004;font-weight:700;
}
.section--paper .filter-btn{border-color:var(--paper-300);color:#5B6A76}
.section--paper .filter-btn[aria-pressed="true"]{background:var(--orange-500);border-color:var(--orange-500);color:#231004}
[data-filter-item][hidden]{display:none}

/* ---------- 10. 折叠说明 ---------- */
.fold{
  background:rgba(10,36,56,.72);
  border:var(--line);border-left:2px solid var(--cyan-400);border-radius:2px;
}
.fold + .fold{margin-top:10px}
.fold summary{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:14px 18px;cursor:pointer;font-weight:700;list-style:none;
}
.fold summary::-webkit-details-marker{display:none}
.fold summary::after{content:"+";font-family:var(--font-mono);color:var(--cyan-400);font-size:1.05rem;line-height:1}
.fold[open] summary::after{content:"–";color:var(--orange-500)}
.fold[open] summary{border-bottom:1px solid var(--deep-500)}
.fold__body{padding:14px 18px 18px;color:rgba(246,243,234,.82)}
.section--paper .fold{background:#fff;border-color:var(--paper-300);border-left-color:var(--cyan-700)}
.section--paper .fold summary::after{color:var(--cyan-700)}

/* ---------- 11. 图版容器 ---------- */
.media-frame{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16 / 9;
  border:1px solid var(--deep-500);border-radius:2px;
  background:
    linear-gradient(135deg,rgba(43,231,206,.1),rgba(255,122,47,.07)),
    var(--deep-900);
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(140,163,180,.12) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(140,163,180,.12) 1px,transparent 1px);
  background-size:32px 32px;
}
.media-frame img{width:100%;height:100%;object-fit:cover;position:relative;z-index:1}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame--paper{border-color:var(--paper-300);background:var(--paper-300)}
.media-frame__cap{
  position:absolute;left:0;bottom:0;z-index:2;
  padding:.35em .7em;
  background:var(--paper-100);color:var(--ink-900);
  font-family:var(--font-mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;
}

/* ---------- 12. 路径节点（技能树基础） ---------- */
.path{display:grid;gap:clamp(12px,2vw,20px)}
.path__node{position:relative;padding-left:34px}
.path__dot{
  position:absolute;left:0;top:.45em;width:13px;height:13px;border-radius:50%;
  border:2px solid var(--cyan-400);background:var(--deep-900);
}
.path__node + .path__node::before{
  content:"";position:absolute;left:6px;top:-14px;width:2px;height:14px;
  background:linear-gradient(var(--cyan-400),rgba(43,231,206,.2));
}
.path__label{display:block;font-family:var(--font-mono);font-size:.7rem;letter-spacing:.14em;text-transform:uppercase;color:var(--cyan-400)}

/* ---------- 13. 入场显现 ---------- */
[data-reveal]{transition:opacity .18s var(--ease),transform .18s var(--ease)}
html.js [data-reveal]:not(.is-in){opacity:0;transform:translateY(8px)}

/* ---------- 14. 页脚 ---------- */
.site-footer{
  background:var(--deep-700);
  border-top:1px solid var(--deep-500);
  padding-block:clamp(40px,6vw,72px) clamp(24px,3vw,36px);
  position:relative;
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:-1px;height:2px;
  background:linear-gradient(90deg,var(--cyan-400),rgba(43,231,206,.05) 60%,var(--orange-500));
}
.footer__inner{display:grid;gap:clamp(24px,3.4vw,40px)}
.footer__top{
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.9fr);
  gap:clamp(24px,4vw,56px);align-items:start;
}
.footer__brand{max-width:34ch}
.footer__mark{
  margin:0 0 4px;font-family:var(--font-display);font-weight:900;
  font-size:clamp(1.35rem,2.4vw,1.75rem);letter-spacing:-.02em;color:var(--paper-100);
}
.footer__tag{margin:0 0 14px;font-size:.66rem;letter-spacing:.32em;text-transform:uppercase;color:var(--cyan-400)}
.footer__line{margin:0;font-size:.94rem;color:var(--mist-400);line-height:1.8}
.footer__list--inline{display:flex;flex-wrap:wrap;gap:8px 18px;margin-top:16px}
.footer__cols{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(16px,2.6vw,32px);
}
.footer__col{min-width:0}
.footer__title{
  margin:0 0 12px;font-size:.7rem;font-weight:500;letter-spacing:.16em;text-transform:uppercase;
  color:var(--paper-100);
  padding-bottom:8px;border-bottom:1px solid var(--deep-500);
}
.footer__list{display:grid;gap:8px;font-size:.92rem}
.footer__list a{color:rgba(246,243,234,.76)}
.footer__list a:hover{color:var(--cyan-400);text-decoration:none}
.footer__contact{
  padding-top:clamp(16px,2.4vw,24px);
  border-top:1px solid var(--deep-500);
}
.footer__contact-line{
  display:flex;flex-wrap:wrap;gap:6px 22px;margin:0;
  font-size:.74rem;letter-spacing:.05em;color:var(--mist-400);
}
.footer__contact-line span{display:inline-flex;align-items:baseline}
.footer__legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px;
  padding-top:clamp(14px,2vw,20px);border-top:1px solid var(--deep-500);
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;color:var(--mist-400);
}
.footer__copy,.footer__meta{margin:0}
.footer__meta{color:var(--deep-500)}

/* ---------- 15. 响应式 ---------- */
@media (max-width:1080px){
  .g-main{grid-column:span 8}
  .g-side{grid-column:span 4}
  .footer__top{grid-template-columns:1fr}
  .footer__brand{max-width:none}
}
@media (max-width:900px){
  .g-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .g-main,.g-side,.g-full{grid-column:1 / -1}
  .footer__cols{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:860px){
  .masthead{
    grid-template-columns:auto minmax(0,1fr) auto;
    gap:10px;padding:10px var(--pad);
  }
  .masthead__status{order:1;gap:7px}
  .masthead__status-text{
    position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;
    clip:rect(0 0 0 0);white-space:nowrap;
  }
  .masthead__brand{order:2;align-items:flex-start;justify-self:start;text-align:left}
  .masthead__brand-cn{font-size:1.3rem}
  .masthead__brand-en{display:none}
  .masthead__meta{order:3;gap:8px}
  .masthead__time,.masthead__actions{display:none}
  .nav-toggle{display:inline-flex}
  [data-header].is-compact .masthead__brand-cn{font-size:1.3rem}

  .site-nav{display:none;border-top:1px solid var(--deep-500);background:var(--deep-700)}
  [data-header][data-open] .site-nav{display:block}
  .site-nav__list{
    flex-direction:column;align-items:stretch;gap:0;padding:6px 0 12px;
  }
  .site-nav__list > li{border-bottom:1px solid rgba(18,58,85,.85)}
  .site-nav__list > li:last-child{border-bottom:0}
  .site-nav a{display:flex;width:100%;padding:12px 2px;font-size:1rem}
  .site-nav__cta{display:block;border-bottom:0 !important;padding-top:10px}
  .site-nav__cta .btn{width:100%;padding-block:.72em}
}
@media (max-width:560px){
  body{font-size:16px}
  .footer__cols{grid-template-columns:1fr}
  .footer__list--inline{gap:6px 16px}
  .footer__legal{flex-direction:column;align-items:flex-start}
  .footer__meta{display:none}
  .card--paper{box-shadow:5px 5px 0 var(--paper-300)}
}

/* ---------- 16. 动效退让 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .dot{animation:none}
  html.js [data-reveal]:not(.is-in){opacity:1;transform:none}
}