:root{
  --ease:cubic-bezier(.22,.61,.36,1);
  --pad:clamp(20px,5vw,44px);
  --wrap:1200px;
  --line-2:rgba(33,29,24,.22);
  --hdr:82px;
}
/* 与门户完全一致的顶部导航（抽自 home.html），仅在老版页面使用 */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:60;
  height:82px;display:flex;align-items:center;justify-content:space-between;gap:24px;
  padding-inline:max(var(--pad),calc((100vw - var(--wrap))/2));
  background:rgba(246,241,231,.72);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  backdrop-filter:blur(16px) saturate(140%);
  border-bottom:1px solid transparent;
  transition:background .4s var(--ease),border-color .4s var(--ease),height .4s var(--ease);
}
.site-header.is-scrolled{
  background:rgba(246,241,231,.93);
  border-bottom-color:var(--line);
  height:70px;
}
.site-header .brand{display:inline-flex;align-items:center;gap:12px;flex:none;text-decoration:none;}
.site-header .brand-seal{
  width:42px;height:42px;display:grid;place-items:center;flex:none;
  border-radius:10px;background:var(--cinnabar);color:#fbf5ea;
  font-family:var(--font-display);font-size:24px;line-height:1;
  box-shadow:0 10px 20px -14px rgba(166,61,47,.95);
  transition:transform .6s var(--ease);
}
.site-header .brand:hover .brand-seal{transform:rotate(-6deg) scale(1.04);}
.site-header .brand-words{display:flex;flex-direction:column;line-height:1.15;}
.site-header .brand-words strong{
  font-family:var(--font-display);font-size:19px;font-weight:600;letter-spacing:.14em;color:var(--ink);
}
.site-header .brand-words small{
  margin-top:4px;font-size:9px;letter-spacing:.24em;color:var(--muted-2);
}
.site-header .nav{display:flex;align-items:center;gap:34px;}
.site-header .nav a{
  position:relative;font-size:15px;letter-spacing:.14em;color:var(--ink-2);
  padding:9px 0;transition:color .3s var(--ease);text-decoration:none;
}
.site-header .nav a::after{
  content:"";position:absolute;left:0;bottom:2px;width:100%;height:1px;
  background:var(--cinnabar);transform:scaleX(0);transform-origin:left;
  transition:transform .4s var(--ease);
}
.site-header .nav a:hover{color:var(--cinnabar);}
.site-header .nav a:hover::after{transform:scaleX(1);}
.site-header .nav a.is-active{color:var(--cinnabar);font-weight:600;}
.site-header .nav a.is-active::after{transform:scaleX(1);height:2px;}
.site-header .header-cta.is-active{background:var(--ink);color:var(--paper);border-color:var(--ink);}
.site-header .header-cta{
  display:inline-flex;align-items:center;gap:.5em;
  min-height:44px;padding:0 22px;border-radius:999px;
  border:1px solid var(--line-2);
  font-size:14.5px;letter-spacing:.1em;color:var(--ink);
  transition:background .3s var(--ease),color .3s var(--ease),border-color .3s var(--ease);
  text-decoration:none;
}
.site-header .header-cta:hover{background:var(--ink);color:var(--paper);border-color:var(--ink);}

/* 老版页面的正文让出固定导航高度 */
.legacy .legacy-main{padding-top:var(--hdr);}

@media (max-width:560px){
  .site-header{height:70px;}
  .site-header.is-scrolled{height:64px;}
  .site-header .brand-seal{width:38px;height:38px;font-size:22px;border-radius:9px;}
  .site-header .brand-words strong{font-size:17px;letter-spacing:.12em;}
  .site-header .brand-words small{font-size:8.5px;letter-spacing:.2em;}
  .site-header .header-cta{min-height:42px;padding:0 17px;font-size:13.5px;}
}

/* =========================================================
   手机端导航：由「隐藏」改为页头第二行常驻标签条
   - .nav 被 i18n.js 移入 .header-actions，故按该层级书写
   - 页头两行高度固定为 --hdr，正文留白据此对齐
   ========================================================= */
@media (max-width:756px){
  :root{--hdr:92px;}
  .site-header{
    height:auto;min-height:var(--hdr);
    flex-wrap:wrap;align-content:center;
    justify-content:flex-end;gap:0;
  }
  .site-header.is-scrolled{height:auto;min-height:var(--hdr);}
  /* i18n.js 把导航包进 .header-actions；解包后导航才能占满整行宽度 */
  .site-header .brand{margin-right:auto;}
  .site-header .header-actions{display:contents;}
  .site-header .lang-switch{margin-left:10px;}
  .site-header .header-cta{margin-left:10px;}
  .site-header .nav{
    display:flex;order:9;flex:0 0 100%;
    height:46px;align-items:stretch;justify-content:center;
    gap:clamp(12px,4.6vw,26px);
    margin:0;padding:0;
    overflow-x:auto;overscroll-behavior-x:contain;
    -webkit-overflow-scrolling:touch;scrollbar-width:none;
  }
  .site-header .nav::-webkit-scrollbar{display:none;}
  .site-header .nav a{
    flex:0 0 auto;display:inline-flex;align-items:center;
    padding:0 2px;font-size:14.5px;letter-spacing:.06em;
    color:var(--ink-2);white-space:nowrap;
  }
  .site-header .nav a::after{bottom:8px;height:2px;}
}

/* 短页面兜底：body 至少一屏高，底部不再露出画布底色 */
body{min-height:100vh;min-height:100svh;}