:root{--blue:#0067b8;--blue-d:#005a9e;--cyan:#00b7c3;--violet:#5b5fc7;--orange:#ff8c00;--ink:#0b0b0b;--gray:#505050;--gray-2:#737373;--line:#e6e6e6;--soft:#f2f2f2;--nav-h:54px;}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{font-family:"Segoe UI","Segoe UI Variable",-apple-system,BlinkMacSystemFont,"Helvetica Neue","Microsoft YaHei","PingFang SC",sans-serif;color:var(--ink);background:#fff;-webkit-font-smoothing:antialiased;overflow-x:hidden;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer;}
img,svg{display:block;}
::selection{background:var(--blue);color:#fff;}
.wrap{max-width:1600px;margin:0 auto;padding:0 24px;}

/* ============ Header ============ */
.site-header{position:sticky;top:0;z-index:200;background:#fff;border-bottom:1px solid transparent;transition:box-shadow .25s,border-color .25s,background .3s;}
.site-header.scrolled{box-shadow:0 1px 12px rgba(0,0,0,.08);border-color:var(--line);}
.site-header.hidden{display:none;}
.nav-inner{max-width:1600px;margin:0 auto;height:var(--nav-h);padding:0 24px;display:flex;align-items:center;gap:6px;}
.brand{display:flex;align-items:center;gap:12px;padding:8px 8px 8px 0;flex-shrink:0;}
.brand-logo{width:120px;height:44px;object-fit:contain;border-radius:12px;background:#fff;transition:opacity .2s,box-shadow .3s;}
.brand-logo:hover{opacity:.85;}
.main-nav{display:flex;align-items:center;gap:2px;margin-left:6px;}
.nav-item{position:relative;}
.nav-link{display:inline-flex;align-items:center;gap:5px;font-size:13px;color:var(--ink);padding:9px 11px;border-radius:2px;transition:background .15s,color .15s,border-color .25s,box-shadow .25s,transform .18s;white-space:nowrap;cursor:pointer;border:1px solid transparent;}
.nav-link:hover{background:rgba(0,0,0,.045);text-decoration:underline;text-underline-offset:3px;}
.nav-link.on{background:rgba(0,103,184,.08);color:var(--blue);font-weight:600;}
.nav-link .chev{width:9px;height:9px;transition:transform .2s;}
.nav-item:hover .chev{transform:rotate(180deg);}
.mega{position:absolute;top:calc(100% + 6px);left:-8px;min-width:260px;background:#fff;border:1px solid var(--line);border-radius:6px;box-shadow:0 12px 32px rgba(0,0,0,.13);padding:10px;opacity:0;visibility:hidden;transform:translateY(-6px);transition:opacity .18s,transform .18s,visibility .18s;}
.nav-item:hover .mega{opacity:1;visibility:visible;transform:translateY(0);}
.mega a{display:block;padding:10px 12px;border-radius:4px;font-size:13px;line-height:1.4;transition:background .15s;color:var(--ink);}
.mega a:hover{background:var(--soft);}
.mega a span{display:block;font-size:11.5px;color:var(--gray-2);margin-top:2px;}
.nav-actions{margin-left:auto;display:flex;align-items:center;gap:8px;}
.nav-actions .nav-link{font-size:13px;}
.icon-btn{width:38px;height:38px;border-radius:3px;display:inline-flex;align-items:center;justify-content:center;transition:background .15s,color .15s,border-color .25s,box-shadow .25s;color:var(--ink);border:1px solid transparent;}
.icon-btn:hover{background:rgba(0,0,0,.06);}
.hamburger{display:none;}

.btn-login{display:inline-flex;align-items:center;gap:7px;padding:8px 16px;border-radius:100px;background:var(--blue);color:#fff;font-size:13px;font-weight:600;line-height:1;box-shadow:0 2px 8px rgba(0,103,184,.25);transition:background .2s,box-shadow .2s,transform .15s;white-space:nowrap;}
.btn-login:hover{background:var(--blue-d);box-shadow:0 4px 14px rgba(0,103,184,.42);transform:translateY(-1px);text-decoration:none;}
.btn-login svg{width:16px;height:16px;stroke:currentColor;flex-shrink:0;}

.auth-area{position:relative;}
.btn-user{display:inline-flex;align-items:center;gap:8px;padding:5px 14px 5px 5px;border-radius:100px;background:#fff;border:1px solid var(--line);font-size:13px;font-weight:600;color:var(--ink);cursor:pointer;transition:background .18s,border-color .18s,box-shadow .18s,color .18s;white-space:nowrap;}
.btn-user:hover{background:var(--soft);border-color:#c8c8c8;box-shadow:0 2px 8px rgba(0,0,0,.06);}
.btn-user .avatar{width:26px;height:26px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,#4a9eff,#0067c0);color:#fff;font-size:12px;font-weight:700;flex-shrink:0;overflow:hidden;}
.btn-user .nickname{max-width:120px;overflow:hidden;text-overflow:ellipsis;}
.btn-user .avatar img{width:100%;height:100%;border-radius:50%;object-fit:cover;display:block;}
.user-menu .menu-head .avatar img{width:100%;height:100%;border-radius:50%;object-fit:cover;display:block;}

.user-menu{position:absolute;top:calc(100% + 8px);right:0;min-width:220px;padding:6px;border-radius:8px;background:rgba(249,249,249,.96);backdrop-filter:blur(30px) saturate(1.8);box-shadow:0 0 0 1px rgba(0,0,0,.09),0 14px 40px rgba(0,0,0,.2);opacity:0;visibility:hidden;transform:translateY(-4px);transition:opacity .16s,transform .16s,visibility .16s;z-index:300;}
.user-menu.open{opacity:1;visibility:visible;transform:translateY(0);}
.user-menu .menu-head{padding:10px 12px 12px;border-bottom:1px solid var(--line);margin-bottom:6px;}
.user-menu .menu-head .name{font-size:13.5px;font-weight:600;color:var(--ink);margin-bottom:3px;}
.user-menu .menu-head .email{font-size:11.5px;color:var(--gray-2);word-break:break-all;line-height:1.4;}
.user-menu .menu-item{display:flex;align-items:center;gap:10px;width:100%;padding:9px 12px;border-radius:5px;font-size:13px;color:var(--ink);text-align:left;transition:background .12s;text-decoration:none;cursor:pointer;}
.user-menu .menu-item:hover{background:rgba(0,0,0,.06);text-decoration:none;}
.user-menu .menu-item svg{width:15px;height:15px;opacity:.7;flex-shrink:0;}

/* ============ 搜索浮层 ============ */
.search-overlay{position:fixed;inset:0;z-index:900;background:rgba(11,11,11,.5);backdrop-filter:blur(6px);display:none;align-items:flex-start;justify-content:center;padding:80px 20px 20px;opacity:0;transition:opacity .22s;}
.search-overlay.open{display:flex;opacity:1;}
.search-panel{width:100%;max-width:640px;background:#fff;border-radius:14px;box-shadow:0 24px 64px rgba(0,0,0,.32);overflow:hidden;transform:translateY(-12px) scale(.98);transition:transform .22s cubic-bezier(.2,.7,.3,1);max-height:calc(100vh - 120px);display:flex;flex-direction:column;}
.search-overlay.open .search-panel{transform:translateY(0) scale(1);}
.search-input-wrap{display:flex;align-items:center;gap:12px;padding:16px 20px;border-bottom:1px solid var(--line);}
.search-input-wrap svg{width:20px;height:20px;color:var(--gray-2);flex-shrink:0;}
.search-input-wrap input{flex:1;font-size:16px;color:var(--ink);border:none;outline:none;background:transparent;font-family:inherit;}
.search-input-wrap input::placeholder{color:#9a9a9a;}
.search-esc{padding:5px 10px;border-radius:5px;font-size:11px;font-weight:600;color:var(--gray-2);background:var(--soft);border:1px solid var(--line);transition:background .15s;flex-shrink:0;}
.search-esc:hover{background:#e6e6e6;color:var(--ink);}
.search-results{padding:8px;overflow-y:auto;max-height:calc(100vh - 260px);}
.search-hint{padding:36px 20px;text-align:center;font-size:13.5px;color:var(--gray-2);}
.search-loading{padding:30px;text-align:center;font-size:13.5px;color:var(--gray-2);}
.search-loading .spinner{display:inline-block;width:20px;height:20px;border:2.5px solid var(--line);border-top-color:var(--blue);border-radius:50%;animation:searchspin .7s linear infinite;vertical-align:middle;margin-right:8px;}
@keyframes searchspin{to{transform:rotate(360deg);}}
.search-result{display:flex;gap:12px;padding:12px;border-radius:8px;cursor:pointer;transition:background .12s;align-items:flex-start;}
.search-result:hover{background:var(--soft);}
.search-result-cover{width:64px;height:48px;border-radius:6px;background:linear-gradient(135deg,#5b5fc7,#0067b8);flex-shrink:0;display:flex;align-items:center;justify-content:center;color:#fff;font-size:20px;font-weight:700;background-size:cover;background-position:center;overflow:hidden;}
.search-result-body{flex:1;min-width:0;}
.search-result-title{font-size:14px;font-weight:600;margin-bottom:3px;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;}
.search-result-title mark{background:#fff3a3;color:inherit;padding:0 1px;border-radius:2px;}
.search-result-desc{font-size:12.5px;color:var(--gray-2);line-height:1.5;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;margin-bottom:5px;}
.search-result-desc mark{background:#fff3a3;color:inherit;padding:0 1px;border-radius:2px;}
.search-result-meta{display:flex;align-items:center;gap:10px;font-size:11.5px;color:var(--gray-2);}
.search-result-type{display:inline-flex;align-items:center;gap:3px;padding:2px 8px;border-radius:100px;font-size:10.5px;font-weight:600;background:rgba(0,103,184,.08);color:var(--blue);}
.search-result-type.post{background:rgba(0,183,195,.1);color:#007b8a;}
.search-result-type.embedded{background:rgba(16,124,16,.1);color:#107c10;}
.search-result-type svg{width:10px;height:10px;}

/* ============ 通用组件 ============ */
.btn{display:inline-flex;align-items:center;gap:8px;font-size:14.5px;font-weight:600;padding:12px 26px;border-radius:4px;transition:transform .18s,background .18s,box-shadow .18s,color .18s;cursor:pointer;}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 6px 20px rgba(0,103,184,.35);}
.btn-primary:hover{background:var(--blue-d);transform:translateY(-2px);box-shadow:0 10px 26px rgba(0,103,184,.45);}
.btn-ghost{color:#fff;border:1px solid rgba(255,255,255,.42);}
.btn-ghost:hover{background:rgba(255,255,255,.12);border-color:#fff;transform:translateY(-2px);}
.btn .arw{transition:transform .2s;}
.btn:hover .arw{transform:translateX(4px);}

.section{max-width:1600px;margin:0 auto;padding:76px 24px;}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:36px;flex-wrap:wrap;}
.section-title{font-size:clamp(1.5rem,2.6vw,2.05rem);font-weight:600;letter-spacing:-.02em;}
.section-sub{font-size:14px;color:var(--gray-2);margin-top:8px;max-width:560px;line-height:1.6;}
.link-more{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--blue);white-space:nowrap;cursor:pointer;}
.link-more:hover{text-decoration:underline;text-underline-offset:4px;}
.link-more svg{transition:transform .2s;}
.link-more:hover svg{transform:translateX(3px);}

.grid{display:grid;gap:24px;}
.grid-4{grid-template-columns:repeat(4,1fr);}
.grid-3{grid-template-columns:repeat(3,1fr);}
.grid-2{grid-template-columns:repeat(2,1fr);}

.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s cubic-bezier(.2,.7,.3,1),transform .7s cubic-bezier(.2,.7,.3,1);}
.reveal.in{opacity:1;transform:none;}
.grid .reveal:nth-child(1){transition-delay:.05s;}
.grid .reveal:nth-child(2){transition-delay:.13s;}
.grid .reveal:nth-child(3){transition-delay:.21s;}
.grid .reveal:nth-child(4){transition-delay:.29s;}

.loading-hint{grid-column:1/-1;text-align:center;padding:50px 20px;color:var(--gray-2);font-size:13.5px;}

/* ============ 页脚 ============ */
.site-footer{background:var(--soft);color:var(--gray);padding:52px 0 28px;font-size:12.5px;}
.footer-cols{max-width:1600px;margin:0 auto;padding:0 24px 40px;display:grid;grid-template-columns:repeat(5,1fr);gap:28px;}
.footer-cols h4{font-size:12.5px;font-weight:600;color:var(--ink);margin-bottom:14px;letter-spacing:.01em;}
.footer-cols ul{list-style:none;display:flex;flex-direction:column;gap:10px;}
.footer-cols a{color:var(--gray-2);line-height:1.5;transition:color .15s;}
.footer-cols a:hover{color:var(--blue);text-decoration:underline;text-underline-offset:3px;}
.footer-bottom{max-width:1600px;margin:0 auto;padding:22px 24px 0;border-top:1px solid #dcdcdc;display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;}
.footer-bottom-links{display:flex;gap:24px;flex-wrap:wrap;align-items:center;}
.footer-bottom-links a{color:var(--gray-2);display:inline-flex;align-items:center;gap:6px;}
.footer-bottom-links a:hover{color:var(--blue);text-decoration:underline;}
.socials{display:flex;gap:6px;}
.socials a{width:32px;height:32px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;background:rgba(0,0,0,.06);transition:background .18s,transform .18s;}
.socials a:hover{background:var(--blue);transform:translateY(-2px);}
.socials a:hover svg{stroke:#fff;}
.socials svg{stroke:var(--ink);width:15px;height:15px;}

/* ============ team 页：往下滚 → 深色胶囊按钮 ============ */
.site-header.transparent{
  background:transparent;
  border-bottom-color:transparent;
  box-shadow:none;
}

.site-header.transparent .main-nav .nav-link,
.site-header.transparent .nav-actions .nav-link{
  background:rgba(15,20,32,.62);
  color:#fff;
  backdrop-filter:blur(16px) saturate(1.6);
  -webkit-backdrop-filter:blur(16px) saturate(1.6);
  border:1px solid rgba(255,255,255,.14);
  border-radius:100px;
  padding:8px 15px;
  margin:0 3px;
  box-shadow:0 4px 16px rgba(0,0,0,.28);
}
.site-header.transparent .main-nav .nav-link:hover,
.site-header.transparent .nav-actions .nav-link:hover{
  background:rgba(40,50,72,.78);
  border-color:rgba(255,255,255,.30);
  transform:translateY(-1px);
  text-decoration:none;
}
.site-header.transparent .main-nav .nav-link.on{
  background:linear-gradient(135deg, rgba(0,183,195,.88), rgba(91,95,199,.88));
  border-color:rgba(143,214,255,.55);
  color:#fff;
}

.site-header.transparent .icon-btn{
  background:rgba(15,20,32,.62);
  color:#fff;
  backdrop-filter:blur(16px) saturate(1.6);
  -webkit-backdrop-filter:blur(16px) saturate(1.6);
  border:1px solid rgba(255,255,255,.14);
  border-radius:50%;
  box-shadow:0 4px 16px rgba(0,0,0,.28);
}
.site-header.transparent .icon-btn:hover{
  background:rgba(40,50,72,.78);
  border-color:rgba(255,255,255,.30);
}

.site-header.transparent .btn-user{
  background:rgba(15,20,32,.62);
  color:#fff;
  border-color:rgba(255,255,255,.14);
  backdrop-filter:blur(16px) saturate(1.6);
  -webkit-backdrop-filter:blur(16px) saturate(1.6);
  box-shadow:0 4px 16px rgba(0,0,0,.28);
}
.site-header.transparent .btn-user:hover{
  background:rgba(40,50,72,.78);
  border-color:rgba(255,255,255,.30);
}
.site-header.transparent .btn-user .avatar{
  background:rgba(255,255,255,.20);
  color:#fff;
}

.site-header.transparent .btn-login{
  background:var(--blue);
  box-shadow:0 6px 20px rgba(0,103,184,.55);
}
.site-header.transparent .btn-login:hover{
  background:var(--blue-d);
  box-shadow:0 8px 24px rgba(0,103,184,.68);
}

.site-header.transparent .brand-logo{
  background:#fff;
  box-shadow:0 4px 16px rgba(0,0,0,.28);
}

.site-header.transparent .mega{
  background:#fff;
  border-color:rgba(0,0,0,.08);
}
.site-header.transparent .mega a{color:var(--ink);}
.site-header.transparent .mega a:hover{background:var(--soft);}
.site-header.transparent .mega a span{color:var(--gray-2);}

@media (max-width:980px){
  .site-header.transparent .main-nav.open{
    background:#fff;
    border-bottom-color:var(--line);
    box-shadow:0 14px 30px rgba(0,0,0,.10);
    backdrop-filter:none;
    -webkit-backdrop-filter:none;
  }
  .site-header.transparent .main-nav.open .nav-link{
    background:transparent!important;
    color:var(--ink)!important;
    border:none!important;
    box-shadow:none!important;
    border-radius:2px!important;
    margin:0!important;
    padding:12px 8px!important;
  }
  .site-header.transparent .main-nav.open .nav-link.on{
    background:rgba(0,103,184,.08)!important;
    color:var(--blue)!important;
  }
  .site-header.transparent .main-nav.open .mega{
    background:transparent;
    border-left-color:var(--line);
    border-radius:0;
    box-shadow:none;
  }
  .site-header.transparent .main-nav.open .mega a{color:var(--ink);}
  .site-header.transparent .main-nav.open .mega a:hover{background:var(--soft);}
  .site-header.transparent .main-nav.open .mega a span{color:var(--gray-2);}
}

/* ============ 消息数字徽章 ============ */
.msg-badge{
  position:absolute;
  top:-2px;
  right:-4px;
  min-width:16px;
  height:16px;
  padding:0 4px;
  border-radius:8px;
  background:#ff5f57;
  color:#fff;
  font-size:10px;
  font-weight:700;
  line-height:16px;
  text-align:center;
  box-shadow:0 0 0 2px #fff;
  pointer-events:none;
  box-sizing:border-box;
  letter-spacing:.2px;
}
.site-header.transparent .msg-badge{
  box-shadow:0 0 0 2px rgba(15,20,32,.9);
}

/* ============ 响应式 ============ */
@media (max-width:1180px){.grid-4{grid-template-columns:repeat(2,1fr);}.footer-cols{grid-template-columns:repeat(3,1fr);}}
@media (max-width:980px){
  .main-nav{display:none;}
  .main-nav.open{display:flex;flex-direction:column;align-items:stretch;gap:2px;position:absolute;top:var(--nav-h);left:0;right:0;background:#fff;padding:14px 24px 22px;border-bottom:1px solid var(--line);box-shadow:0 14px 30px rgba(0,0,0,.10);margin-left:0;}
  .main-nav.open .nav-link{padding:12px 8px;font-size:15px;}
  .main-nav.open .mega{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:none;border-left:2px solid var(--line);border-radius:0;padding:4px 0 4px 10px;margin:2px 0 8px 8px;}
  .hamburger{display:inline-flex;}
  .nav-actions .nav-link{display:none;}
  .btn-login span{display:none;}
  .btn-login{padding:8px 10px;}
  .btn-login svg{width:18px;height:18px;}
  .btn-user .nickname{display:none;}
  .btn-user{padding:5px;}
  .btn-user .avatar{width:28px;height:28px;font-size:13px;}
  .grid-3,.grid-2{grid-template-columns:1fr;}
}
@media (max-width:640px){
  .wrap,.nav-inner,.section,.footer-cols,.footer-bottom{padding-left:18px;padding-right:18px;}
  .nav-inner{padding:0 14px;}
  .grid-4{grid-template-columns:1fr;}
  .footer-cols{grid-template-columns:repeat(2,1fr);gap:26px 18px;}
  .section{padding-top:54px;padding-bottom:54px;}
  .brand-logo{width:100px;}
  .search-overlay{padding:40px 12px 12px;}
  .search-input-wrap{padding:14px 16px;}
  .search-input-wrap input{font-size:15px;}
  .search-esc{display:none;}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition-duration:.01ms!important;}.reveal{opacity:1;transform:none;}}