:root{
    --bg:#070713; --bg2:#0b0c1c; --panel:#11122c; --line:rgba(138,123,255,.14);
    --neon:#8b7bff; --neon2:#6aa0ff; --txt:#e6f0ff; --sub:#8e92c8;
  }
  *{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
  html{scroll-behavior:smooth}
  body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
    background:var(--bg);color:var(--txt);overflow-x:hidden;line-height:1.6}
  a{color:inherit;text-decoration:none}
  .mono{font-family:"SF Mono",ui-monospace,Menlo,Consolas,monospace}
  svg{display:block}

  /* ===== living background ===== */
  #net{position:fixed;inset:0;z-index:-3;display:block}
  .bg{position:fixed;inset:0;z-index:-4;background:var(--bg)}
  .orb{position:fixed;border-radius:50%;filter:blur(70px);z-index:-3;pointer-events:none;opacity:.5}
  .orb.a{width:520px;height:520px;left:-120px;top:-80px;
    background:radial-gradient(circle,rgba(138,123,255,.5),transparent 70%);animation:breathe 9s ease-in-out infinite}
  .orb.b{width:560px;height:560px;right:-160px;top:30%;
    background:radial-gradient(circle,rgba(106,160,255,.45),transparent 70%);animation:breathe 11s ease-in-out infinite 1.5s}
  .orb.c{width:480px;height:480px;left:25%;bottom:-160px;
    background:radial-gradient(circle,rgba(138,123,255,.35),transparent 70%);animation:breathe 13s ease-in-out infinite .8s}
  @keyframes breathe{0%,100%{transform:scale(1) translateY(0);opacity:.42}50%{transform:scale(1.18) translateY(-18px);opacity:.62}}
  .grid{position:fixed;inset:0;z-index:-2;opacity:.3;
    background-image:linear-gradient(rgba(138,123,255,.05) 1px,transparent 1px),
                     linear-gradient(90deg,rgba(138,123,255,.05) 1px,transparent 1px);
    background-size:48px 48px;
    mask-image:radial-gradient(circle at 50% 30%,#000 0%,transparent 82%);
    animation:drift 26s linear infinite}
  @keyframes drift{from{background-position:0 0,0 0}to{background-position:48px 480px,480px 0}}

  /* ===== nav ===== */
  header{position:sticky;top:0;z-index:50;backdrop-filter:blur(12px);
    background:rgba(7,8,22,.66);border-bottom:1px solid var(--line)}
  nav{max-width:1080px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:14px 20px}
  .logo{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:1px}
  .logo .mark{height:38px;width:auto;display:block;position:relative;top:-3px;overflow:visible;
    animation:mglow 2.8s ease-in-out infinite}
  .logo .mark .fill{opacity:0;animation:logofill .8s ease-out 1.8s forwards}
  @keyframes logofill{to{opacity:1}}
  @keyframes trace{from{stroke-dashoffset:var(--p)}to{stroke-dashoffset:0}}
  @keyframes mglow{0%,100%{filter:drop-shadow(0 0 4px rgba(138,123,255,.5))}50%{filter:drop-shadow(0 0 12px rgba(138,123,255,.95))}}
  .logo small{display:block;font-size:9px;letter-spacing:3px;color:var(--neon);font-weight:600}
  .links{display:flex;gap:26px;font-size:14px;color:var(--sub)}
  .links a{position:relative;transition:.2s}
  .links a::after{content:"";position:absolute;left:0;bottom:-5px;height:2px;width:0;background:var(--neon);
    box-shadow:0 0 8px var(--neon);transition:width .25s}
  .links a:hover{color:var(--neon)}.links a:hover::after{width:100%}
  .menu{display:none;font-size:24px;color:var(--neon);cursor:pointer}
  .lang{margin-left:16px;background:transparent;border:1px solid var(--line);color:var(--sub);font-size:12px;letter-spacing:1px;padding:5px 12px;border-radius:20px;cursor:pointer;font-family:inherit;transition:.2s;white-space:nowrap}
  .lang:hover{border-color:var(--neon);color:var(--neon);box-shadow:0 0 12px rgba(138,123,255,.25)}
  .login-btn{background:linear-gradient(120deg,var(--neon),var(--neon2));color:#160a26;border-color:transparent;font-weight:700;text-decoration:none}
  .login-btn:hover{color:#160a26;box-shadow:0 0 16px rgba(138,123,255,.55)}

  section{max-width:1080px;margin:0 auto;padding:90px 20px;position:relative}
  .eyebrow{color:var(--neon);font-size:12px;letter-spacing:4px;text-transform:uppercase;margin-bottom:14px}
  h2{font-size:30px;letter-spacing:1px;margin-bottom:14px}
  .lead{color:var(--sub);max-width:620px}

  .reveal{opacity:0;transform:translateY(30px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
  .reveal.up{transform:translateY(-30px)}
  .reveal.in{opacity:1;transform:none}
  .reveal.d1{transition-delay:.08s}.reveal.d2{transition-delay:.16s}.reveal.d3{transition-delay:.24s}
  .reveal.d4{transition-delay:.32s}.reveal.d5{transition-delay:.4s}

  /* ===== hero ===== */
  .hero{min-height:92vh;display:flex;flex-direction:column;justify-content:center;padding-top:40px}
  .tag{display:inline-flex;align-items:center;gap:9px;border:1px solid var(--line);border-radius:30px;
    padding:7px 16px;font-size:12.5px;color:var(--neon);margin-bottom:26px;width:max-content;background:rgba(138,123,255,.05)}
  .tag .pulse{width:7px;height:7px;border-radius:50%;background:var(--neon);position:relative}
  .tag .pulse::after{content:"";position:absolute;inset:-4px;border-radius:50%;border:1px solid var(--neon);animation:ring 1.8s ease-out infinite}
  @keyframes ring{0%{transform:scale(.6);opacity:.9}100%{transform:scale(2.4);opacity:0}}
  .hero h1{font-size:66px;line-height:1.02;font-weight:900;letter-spacing:2px;
    background:linear-gradient(100deg,#fff 0%,var(--neon) 35%,var(--neon2) 60%,#fff 100%);
    background-size:220% auto;-webkit-background-clip:text;background-clip:text;color:transparent;
    animation:flow 6s linear infinite,glowpulse 4s ease-in-out infinite;margin-bottom:10px;
    filter:drop-shadow(0 0 18px rgba(138,123,255,.18))}
  @keyframes flow{to{background-position:220% center}}
  @keyframes glowpulse{0%,100%{filter:drop-shadow(0 0 14px rgba(138,123,255,.15))}50%{filter:drop-shadow(0 0 30px rgba(106,160,255,.35))}}
  .hero .en{font-size:14px;letter-spacing:8px;color:var(--neon);margin-bottom:22px;min-height:20px}
  .hero p{font-size:18px;color:var(--sub);max-width:560px;margin-bottom:34px}
  .cta{display:flex;gap:14px;flex-wrap:wrap}
  .btn{padding:13px 26px;border-radius:10px;font-weight:700;font-size:15px;cursor:pointer;
    border:1px solid transparent;transition:.2s;position:relative;overflow:hidden;display:inline-block}
  .btn.p{background:linear-gradient(120deg,var(--neon),var(--neon2));color:#160a26;
    box-shadow:0 0 26px rgba(138,123,255,.35);animation:btnbreathe 3.4s ease-in-out infinite}
  @keyframes btnbreathe{0%,100%{box-shadow:0 0 20px rgba(138,123,255,.3)}50%{box-shadow:0 0 38px rgba(138,123,255,.6)}}
  .btn.p::before{content:"";position:absolute;top:0;left:-120%;width:60%;height:100%;
    background:linear-gradient(110deg,transparent,rgba(255,255,255,.55),transparent);transform:skewX(-20deg);animation:shine 3.2s ease-in-out infinite}
  @keyframes shine{0%{left:-120%}55%,100%{left:160%}}
  .btn.p:hover{transform:translateY(-2px)}
  .btn.g{border-color:var(--line);color:var(--txt)}
  .btn.g:hover{border-color:var(--neon);color:var(--neon);box-shadow:0 0 20px rgba(138,123,255,.2)}
  .stats{display:flex;gap:40px;margin-top:54px;flex-wrap:wrap}
  .stat b{font-size:30px;color:var(--neon);font-weight:800;text-shadow:0 0 16px rgba(138,123,255,.4)}
  .stat span{display:block;font-size:12px;color:var(--sub);letter-spacing:1px}

  /* ===== icons ===== */
  .ic{margin-bottom:15px;color:var(--neon);display:inline-flex;
    filter:drop-shadow(0 0 7px rgba(138,123,255,.45));transition:.3s;animation:icpulse 2.4s ease-in-out infinite}
  @keyframes icpulse{0%,100%{filter:drop-shadow(0 0 6px rgba(138,123,255,.45))}50%{filter:drop-shadow(0 0 18px rgba(138,123,255,.9))}}
  .ic svg{width:30px;height:30px;stroke:currentColor;fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
  .ic svg *{transition:stroke-dashoffset 1.15s cubic-bezier(.4,.8,.3,1)}

  /* ===== cards ===== */
  .cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:40px}
  .card{background:linear-gradient(160deg,var(--panel),rgba(15,17,42,.4));
    border:1px solid var(--line);border-radius:16px;padding:24px;transition:.28s;position:relative;overflow:hidden}
  .card::before{content:"";position:absolute;inset:0;border-radius:16px;padding:1px;
    background:linear-gradient(130deg,transparent,rgba(138,123,255,.5),transparent);
    -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
    -webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:.3s}
  .card:hover{transform:translateY(-6px);box-shadow:0 18px 50px rgba(138,123,255,.14)}
  .card:hover::before{opacity:1}
  .card:hover .ic{transform:scale(1.14) translateY(-2px);filter:drop-shadow(0 0 12px rgba(138,123,255,.7))}
  .card h3{font-size:17px;margin-bottom:8px}
  .card p{font-size:13.5px;color:var(--sub)}
  .card .no{position:absolute;top:14px;right:18px;font-size:12px;color:rgba(255,255,255,.18)}
  .card.wide{grid-column:1 / -1;display:flex;flex-direction:column;align-items:center;text-align:center;
    padding:40px 28px;border-color:rgba(138,123,255,.5);
    background:linear-gradient(135deg,rgba(138,123,255,.14),rgba(106,160,255,.05))}
  .card.wide .ic svg{width:42px;height:42px}
  .card.wide h3{font-size:25px;margin-top:4px}
  .card.wide p{font-size:15px;max-width:640px}

  /* ===== projects ===== */
  .proj{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:36px}
  .pitem{border:1px solid var(--line);border-radius:14px;padding:20px 22px;background:rgba(15,17,42,.5);transition:.25s}
  .pitem:hover{border-color:rgba(138,123,255,.45);transform:translateX(4px);box-shadow:-6px 0 24px rgba(138,123,255,.1)}
  .pitem .k{font-size:11px;color:var(--neon);letter-spacing:2px;margin-bottom:6px}
  .pitem h4{font-size:16px;margin-bottom:6px}
  .pitem p{font-size:13px;color:var(--sub)}

  /* ===== apply ===== */
  .formwrap{background:linear-gradient(160deg,var(--panel),rgba(15,17,42,.3));
    border:1px solid var(--line);border-radius:20px;padding:40px 34px;margin-top:36px;max-width:680px;position:relative;overflow:hidden}
  .formwrap::after{content:"";position:absolute;width:300px;height:300px;border-radius:50%;
    background:radial-gradient(circle,rgba(138,123,255,.16),transparent 70%);right:-80px;top:-80px;animation:breathe 7s ease-in-out infinite}
  .formwrap .ic svg{width:40px;height:40px}

  /* ===== contact ===== */
  .contacts{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:36px}
  .contacts .c{border:1px solid var(--line);border-radius:14px;padding:24px;text-align:center;transition:.25s}
  .contacts .c:hover{border-color:var(--neon);transform:translateY(-4px);box-shadow:0 12px 30px rgba(138,123,255,.12)}
  .contacts .c .ic{margin-bottom:10px}
  .contacts .c .ic svg{width:26px;height:26px;margin:0 auto}
  .contacts .c .k{font-size:12px;color:var(--sub);letter-spacing:1px}
  .contacts .c .v{font-size:15px;margin-top:4px;color:var(--neon)}

  footer{border-top:1px solid var(--line);padding:30px 20px;text-align:center;color:var(--sub);font-size:13px}

  @media(max-width:860px){
    .links{display:none}.menu{display:block}
    .cards,.proj,.contacts{grid-template-columns:1fr}
    .hero h1{font-size:42px}section{padding:64px 18px}
  }
  @media(prefers-reduced-motion:reduce){*{animation:none!important}}


  /* ===== detail pages ===== */
  a.card{display:block}
  main{display:block}
  .hero-sub{padding-top:74px}
  .hero-sub h1{font-size:44px;font-weight:900;letter-spacing:1px;line-height:1.1;margin-bottom:14px;
    background:linear-gradient(100deg,#fff,var(--neon) 55%,var(--neon2));-webkit-background-clip:text;background-clip:text;color:transparent;
    filter:drop-shadow(0 0 16px rgba(138,123,255,.18))}
  .crumb{font-size:12px;color:var(--sub);letter-spacing:1px;margin-bottom:22px}
  .crumb a{color:var(--sub);transition:.2s}.crumb a:hover{color:var(--neon)}
  .crumb .sep{margin:0 9px;opacity:.5}
  .cap-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:32px}
  a.cap{display:block}
  .cap{border:1px solid var(--line);border-radius:14px;padding:22px;background:rgba(15,17,42,.5);transition:.25s}
  .cap:hover{border-color:rgba(138,123,255,.45);transform:translateY(-4px);box-shadow:0 12px 30px rgba(138,123,255,.1)}
  .cap .ic{margin-bottom:6px}.cap .ic svg{width:26px;height:26px}
  .cap h3{font-size:16px;margin:6px 0 6px}
  .cap p{font-size:13.5px;color:var(--sub)}
  .flow{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;margin-top:32px}
  .flow-step{border:1px solid var(--line);border-radius:14px;padding:22px 16px;background:rgba(15,17,42,.5);text-align:center;transition:.25s}
  .flow-step:hover{border-color:rgba(138,123,255,.4);transform:translateY(-4px)}
  .flow-step .n{font-size:24px;font-weight:800;color:var(--neon);text-shadow:0 0 14px rgba(138,123,255,.4)}
  .flow-step h4{font-size:14px;margin:8px 0 6px}
  .flow-step p{font-size:12px;color:var(--sub);line-height:1.5}
  /* 广告位:AdSense 过审前隐藏,过审后把 display 改为 flex 并在容器内 push 广告即可 */
  .ad-slot{display:none;min-height:280px;align-items:center;justify-content:center;margin:34px 0;
    border-radius:14px;background:var(--bg2);overflow:hidden}
  /* ===== 右下角浮动"合作申请"按钮 ===== */
  .fab{position:fixed;right:24px;bottom:24px;z-index:60;display:flex;align-items:center;
    height:58px;width:58px;border-radius:29px;overflow:hidden;white-space:nowrap;
    background:linear-gradient(120deg,var(--neon),var(--neon2));color:#160a26;text-decoration:none;
    box-shadow:0 10px 30px rgba(138,123,255,.5);transition:width .32s cubic-bezier(.2,.7,.2,1),box-shadow .3s;
    animation:btnbreathe 3.4s ease-in-out infinite}
  .fab svg{width:26px;height:26px;min-width:26px;margin:0 16px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
  .fab-label{font-weight:800;font-size:14.5px;letter-spacing:1px;opacity:0;transition:opacity .2s;padding-right:22px}
  .fab:hover{width:172px;box-shadow:0 12px 40px rgba(138,123,255,.75)}
  .fab:hover .fab-label{opacity:1}
  @media(max-width:860px){
    .cap-grid{grid-template-columns:1fr}.flow{grid-template-columns:1fr}.hero-sub h1{font-size:32px}
    .fab{right:16px;bottom:16px}
  }

  /* ===== 开源公益站(foss) ===== */
  .foss-bar{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin:18px 0 6px}
  .foss-tools{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:24px 0 8px}
  .foss-search{flex:1;min-width:200px;background:rgba(15,17,42,.6);border:1px solid var(--line);
    border-radius:10px;padding:11px 16px;color:var(--txt);font-family:inherit;font-size:14px;outline:none;transition:.2s}
  .foss-search:focus{border-color:var(--neon);box-shadow:0 0 0 3px rgba(138,123,255,.15)}
  .chips{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}
  .chip{background:rgba(15,17,42,.6);border:1px solid var(--line);color:var(--sub);
    padding:7px 15px;border-radius:20px;font-size:13px;cursor:pointer;font-family:inherit;transition:.2s}
  .chip:hover{border-color:var(--neon);color:var(--neon)}
  .chip.on{background:linear-gradient(120deg,var(--neon),var(--neon2));color:#160a26;border-color:transparent;font-weight:700}
  #foss-list .card{display:flex;flex-direction:column}
  #foss-list .card .no{font-size:11px;letter-spacing:1px;color:var(--neon);opacity:.7}
  #foss-list .card p{flex:1}
  #foss-list .card .btn{width:100%;text-align:center;font-size:14px;padding:11px}
  /* 认证表单 */
  .auth-tabs{display:flex;gap:8px;justify-content:center;margin-bottom:22px}
  .auth-tab{background:transparent;border:1px solid var(--line);color:var(--sub);padding:9px 24px;
    border-radius:20px;cursor:pointer;font-family:inherit;font-size:14px;transition:.2s}
  .auth-tab.on{background:linear-gradient(120deg,var(--neon),var(--neon2));color:#160a26;border-color:transparent;font-weight:700}
  .field{display:block;width:100%;background:rgba(15,17,42,.6);border:1px solid var(--line);border-radius:10px;
    padding:13px 16px;color:var(--txt);font-family:inherit;font-size:15px;outline:none;margin-bottom:14px;transition:.2s}
  .field:focus{border-color:var(--neon);box-shadow:0 0 0 3px rgba(138,123,255,.15)}
  .msg{min-height:20px;font-size:13px;color:var(--sub);margin-top:6px}
  /* 个人中心 */
  .me-row{display:flex;justify-content:space-between;align-items:center;padding:14px 0;border-bottom:1px solid var(--line)}
  .me-row span{color:var(--sub);font-size:14px}
  .me-row b{font-size:15px}
  .me-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}