:root{
    --green:#2e7d32;
    --green-light:#e8f5e9;
    --green-dark:#1b5e20;
    --gold:#c8a24b;
    --text:#2b2b2b;
    --muted:#8a8a8a;
    --border:#e0e0e0;
  }
  *{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
  body{
    font-family:"PingFang SC","Microsoft YaHei",-apple-system,sans-serif;
    background:#f4f6f4;color:var(--text);
    padding-bottom:90px;
  }
  body.showing-intro{background:#a00000;padding-bottom:0;}
  .activity-intro[hidden],.registration-page[hidden]{display:none;}
  .activity-intro{max-width:725px;margin:0 auto;padding-bottom:calc(84px + env(safe-area-inset-bottom));}
  .activity-poster{display:block;width:100%;height:auto;}
  .intro-action{position:fixed;bottom:0;left:0;right:0;z-index:5;padding:12px 20px calc(12px + env(safe-area-inset-bottom));background:rgba(110,0,0,.96);border-top:1px solid #e6b967;}
  .intro-action a{display:block;max-width:480px;margin:0 auto;padding:14px;text-align:center;border-radius:10px;background:linear-gradient(135deg,#ffe2a0,#f5c56f);color:#8d0700;font-size:18px;font-weight:700;text-decoration:none;box-shadow:0 3px 12px rgba(0,0,0,.2);}
  .intro-action a:focus-visible,.intro-return a:focus-visible{outline:3px solid #c8a24b;outline-offset:3px;}
  .intro-return{background:var(--green-dark);padding:12px 20px;}
  .intro-return a{color:#fff;font-size:14px;text-decoration:none;}
  .visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0;}
  /* 顶部横幅 */
  .banner{
    background:linear-gradient(135deg,var(--green-dark) 0%,var(--green) 60%,#43a047 100%);
    color:#fff;padding:34px 20px 40px;text-align:center;position:relative;overflow:hidden;
  }
  .banner::after{
    content:"";position:absolute;width:220px;height:220px;border-radius:50%;
    background:rgba(255,255,255,.06);top:-80px;right:-60px;
  }
  .banner::before{
    content:"";position:absolute;width:160px;height:160px;border-radius:50%;
    background:rgba(255,255,255,.05);bottom:-70px;left:-40px;
  }
  .badge{
    display:inline-block;background:rgba(255,255,255,.15);border:1px solid rgba(255,255,255,.35);
    padding:4px 14px;border-radius:20px;font-size:12px;letter-spacing:2px;margin-bottom:14px;
  }
  .banner h1{font-size:24px;letter-spacing:1px;line-height:1.4;margin-bottom:10px;}
  .banner p{font-size:13px;opacity:.85;line-height:1.7;}
  .divider{width:46px;height:3px;background:var(--gold);border-radius:2px;margin:16px auto 0;}

  /* 活动信息卡片 */
  .info-card{
    max-width:480px;margin:-24px auto 0;background:#fff;border-radius:14px;
    box-shadow:0 6px 24px rgba(0,0,0,.08);padding:20px 18px;position:relative;z-index:2;
  }
  .info-item{display:flex;align-items:flex-start;gap:12px;padding:9px 0;font-size:14px;}
  .info-item .icon{
    width:34px;height:34px;border-radius:9px;background:var(--green-light);
    display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:16px;
  }
  .info-item b{font-weight:600;}
  .info-item span{color:var(--muted);font-size:13px;display:block;margin-top:2px;}

  /* 表单 */
  .form-section{max-width:480px;margin:22px auto;background:#fff;border-radius:14px;padding:22px 18px;box-shadow:0 4px 18px rgba(0,0,0,.05);}
  .form-section h2{font-size:16px;border-left:4px solid var(--green);padding-left:10px;margin-bottom:18px;}
  .signup-slogan{color:var(--green-dark);font-size:14px;line-height:1.7;margin:-6px 0 18px;font-weight:600;}
  .field{margin-bottom:16px;}
  .field label{display:block;font-size:14px;font-weight:600;margin-bottom:7px;}
  .field label .req{color:#e53935;margin-left:2px;}
  .field input,.field select{
    width:100%;padding:12px 14px;border:1px solid var(--border);border-radius:10px;
    font-size:15px;background:#fafafa;outline:none;transition:border .2s;appearance:none;
  }
  .field input:focus,.field select:focus{border-color:var(--green);background:#fff;}
  .field .tip{font-size:12px;color:var(--muted);margin-top:5px;}

  /* 是否用餐 按钮组 */
  .meal-group{display:flex;gap:12px;}
  .meal-group .opt{
    flex:1;padding:12px 0;text-align:center;border:1.5px solid var(--border);
    border-radius:10px;font-size:15px;cursor:pointer;transition:all .2s;background:#fafafa;user-select:none;
  }
  .meal-group .opt.active{border-color:var(--green);background:var(--green-light);color:var(--green-dark);font-weight:600;}

  .submit-btn{
    width:100%;padding:15px 0;border:none;border-radius:12px;font-size:17px;font-weight:600;
    background:linear-gradient(135deg,#43a047,var(--green));color:#fff;letter-spacing:4px;
    box-shadow:0 6px 16px rgba(46,125,50,.35);cursor:pointer;transition:transform .15s;
  }
  .submit-btn:active{transform:scale(.97);}
  .submit-btn:disabled{background:#b5c9b6;box-shadow:none;}

  /* 二维码区 */
  .qr-section{
    max-width:480px;margin:6px auto 24px;background:#fff;border-radius:14px;
    padding:24px 18px;text-align:center;box-shadow:0 4px 18px rgba(0,0,0,.05);
  }
  .qr-section h3{font-size:15px;margin-bottom:6px;}
  .qr-section p{font-size:12px;color:var(--muted);margin-bottom:14px;line-height:1.6;}
  #qrcode{display:inline-block;padding:12px;border:1px solid var(--border);border-radius:12px;background:#fff;}
  #qrcode img,#qrcode canvas{display:block;}

  /* 成功弹层 */
  .mask{
    display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:10;
    align-items:center;justify-content:center;padding:24px;
  }
  .mask.show{display:flex;}
  .success-box{
    background:#fff;border-radius:16px;padding:32px 26px;text-align:center;max-width:340px;width:100%;
    animation:pop .25s ease;
  }
  @keyframes pop{from{transform:scale(.85);opacity:0}to{transform:scale(1);opacity:1}}
  .success-box .check{
    width:64px;height:64px;border-radius:50%;background:var(--green-light);color:var(--green);
    font-size:32px;display:flex;align-items:center;justify-content:center;margin:0 auto 16px;
  }
  .success-box h3{font-size:19px;margin-bottom:10px;}
  .success-box p{font-size:13px;color:var(--muted);line-height:1.8;margin-bottom:20px;}
  .success-box button{
    width:100%;padding:12px 0;border:none;border-radius:10px;background:var(--green);color:#fff;font-size:15px;
  }
  .success-box{max-height:calc(100dvh - 48px);overflow-y:auto;}
  .invitation-share{margin:0 0 18px;padding:14px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border);text-align:left;}
  .invitation-share[hidden]{display:none;}
  .invitation-share label{display:block;font-size:13px;margin-bottom:6px;}
  .invitation-share input{width:100%;min-width:0;padding:10px;border:1px solid var(--border);border-radius:8px;font-size:13px;}
  .success-box .invitation-share p{margin:8px 0;font-size:12px;}
  .success-box .invitation-share #invitationTitle{color:var(--green-dark);font-weight:600;}

  .footer{text-align:center;font-size:11px;color:#b0b0b0;padding:0 20px 10px;line-height:1.8;}
.code-row{display:flex;gap:10px;align-items:center}.code-row input{min-width:0;flex:1}.captcha-button{border:1px solid var(--border);background:#eef6ef;padding:0;height:46px;flex:0 0 130px;border-radius:9px;overflow:hidden;cursor:pointer}.captcha-button img{display:block}.sms-button{flex:0 0 130px;padding:13px 8px;border:1px solid #86b28a;border-radius:9px;background:var(--green-light);color:var(--green-dark);font-size:14px;cursor:pointer}.sms-button:disabled{opacity:.55;cursor:wait}.choice-field{border:0;padding:0}.choice-field legend{font-size:14px;font-weight:600;margin-bottom:8px}.req{color:#e53935;margin-left:2px}.field .choice{position:relative;flex:1;margin:0;font-weight:400}.choice input{position:absolute;opacity:0;width:1px;height:1px}.choice span{display:block;text-align:center;padding:13px 5px;border:1px solid var(--border);border-radius:10px;background:#fafafa;font-size:14px}.choice input:checked+span{background:var(--green-light);border-color:var(--green);color:var(--green-dark);font-weight:600}.choice input:focus-visible+span{outline:2px solid var(--green);outline-offset:2px}.honeypot{position:absolute;left:-10000px;width:1px;height:1px;overflow:hidden}.notice{font-size:12px;line-height:1.7;background:#fff6df;color:#8a6017;padding:12px;border-radius:8px;margin-bottom:18px}.form-message{font-size:13px;line-height:1.7;background:#fff0ec;color:#b7482e;padding:12px;border-radius:8px;margin-bottom:16px}.form-message.is-success{color:var(--green-dark);background:var(--green-light)}.qr-download{display:block;color:var(--green);font-size:12px;margin-top:14px}.success-box p{white-space:normal}.info-card,.form-section,.qr-section{width:calc(100% - 28px)}.banner h1{font-size:23px}.form-section{margin-top:20px}.submit-btn:disabled{cursor:wait}