:root{
    --ink:#24275E; --ink-dark:#13153A; --ink-soft:#3C4080;
    --paper:#FAFAF9; --panel:#FFFFFF; --slate:#5B6178; --line:#E1E2EA;
    --teal:#24275E; --teal-soft:#E7E8F1; --amber:#B9762C; --radius:2px;
  }
  *{box-sizing:border-box;}
  body{margin:0;background:var(--paper);color:var(--ink);font-family:'Inter',sans-serif;font-size:15px;line-height:1.5;}
  h1,h2,.disp{font-family:'Oswald',sans-serif;text-transform:uppercase;letter-spacing:.01em;margin:0;color:var(--ink);}
  .mono{font-family:'IBM Plex Mono',monospace;}
  .wrap{max-width:1180px;margin:0 auto;padding:36px 24px 80px;}
  a{color:var(--teal);}

  /* gate */
  .gate{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;}
  .gate-card{background:#fff;border:1px solid var(--line);padding:40px 36px;max-width:380px;width:100%;border-radius:var(--radius);box-shadow:0 20px 50px rgba(19,21,58,.12);}
  .gate-card h1{font-size:22px;margin-bottom:8px;}
  .gate-card p{color:var(--slate);font-size:14px;margin:0 0 20px;}
  .gate-card input{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:var(--radius);font-size:15px;margin-bottom:14px;}
  .gate-card button{
    width:100%;padding:12px;border:none;background:var(--ink);color:#fff;font-family:'Oswald';
    letter-spacing:.04em;text-transform:uppercase;font-size:14px;border-radius:var(--radius);cursor:pointer;
  }
  .gate-card button:hover{background:var(--ink-soft);}
  .gate-error{color:#B33A3A;font-size:13px;margin-top:10px;display:none;}

  /* admin */
  #admin{display:none;}
  .admin-head{display:flex;justify-content:space-between;align-items:flex-end;gap:20px;flex-wrap:wrap;margin-bottom:26px;}
  .admin-head h1{font-size:30px;}
  .eyebrow{font-family:'IBM Plex Mono';font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--teal);}
  .stat-row{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:26px;}
  .stat{background:#fff;border:1px solid var(--line);padding:14px 20px;border-radius:var(--radius);min-width:120px;}
  .stat b{display:block;font-family:'Oswald';font-size:24px;color:var(--ink);}
  .stat span{font-size:12px;color:var(--slate);}
  .toolbar{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:18px;}
  .toolbar button{
    border:1px solid var(--line);background:#fff;padding:9px 16px;border-radius:var(--radius);
    font-family:'Inter';font-size:13px;cursor:pointer;color:var(--ink);
  }
  .toolbar button:hover{border-color:var(--ink);}
  table{width:100%;border-collapse:collapse;background:#fff;font-size:13.5px;}
  thead th{
    text-align:left;font-family:'IBM Plex Mono';font-size:11px;letter-spacing:.05em;text-transform:uppercase;
    color:var(--slate);border-bottom:1px solid var(--line);padding:10px 12px;background:#F3F3F6;white-space:nowrap;
  }
  tbody td{padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:middle;}
  tbody tr:hover{background:#FAFAFC;}
  .participant-cell{min-width:240px;max-width:310px;vertical-align:top;}
  .participant-name{font-size:14px;font-weight:700;line-height:1.3;color:var(--ink);margin-bottom:6px;}
  .participant-details{display:grid;gap:2px;color:var(--slate);font-size:11.5px;line-height:1.35;}
  .participant-detail{display:grid;grid-template-columns:48px minmax(0,1fr);gap:7px;align-items:baseline;}
  .participant-detail > span:first-child{font-family:'IBM Plex Mono';font-size:9.5px;text-transform:uppercase;letter-spacing:.035em;color:#85899B;}
  .participant-detail > span:last-child{min-width:0;overflow-wrap:anywhere;}
  .registration-cell{min-width:190px;max-width:245px;vertical-align:top;}
  .registration-summary{display:grid;gap:4px;line-height:1.35;}
  .registration-course{font-size:13px;font-weight:600;color:var(--ink);}
  .registration-ticket{font-size:11.5px;color:var(--slate);}
  .registration-day{display:grid;grid-template-columns:54px minmax(0,1fr);gap:7px;align-items:center;margin-top:4px;}
  .registration-day > span{font-family:'IBM Plex Mono',monospace;font-size:9.5px;text-transform:uppercase;letter-spacing:.035em;color:#85899B;}
  .registration-day .handson-day-select{min-width:0;width:100%;font-size:11.5px;padding:5px 7px;}
  .registration-time{font-size:10px;color:#85899B;white-space:nowrap;margin-top:2px;}
  .reference-stack{display:grid;gap:5px;min-width:160px;font-size:11.5px;line-height:1.35;}
  .reference-stack > div{display:grid;grid-template-columns:64px minmax(0,1fr);gap:7px;align-items:baseline;}
  .reference-stack > div > span:first-child{font-family:'IBM Plex Mono';font-size:9.5px;text-transform:uppercase;letter-spacing:.035em;color:#85899B;}
  .reference-stack > div > span:last-child{min-width:0;overflow-wrap:anywhere;}
  .reference-amount{font-weight:600;color:var(--ink);}
  .status-cell{min-width:130px;}
  .status-stack{display:grid;gap:8px;}
  .status-control{display:grid;grid-template-columns:64px 44px;gap:8px;align-items:center;}
  .status-control > span{font-family:'IBM Plex Mono';font-size:9.5px;text-transform:uppercase;letter-spacing:.035em;color:var(--slate);}
  .badge-ese{display:inline-block;font-size:11px;padding:2px 7px;border-radius:3px;font-family:'IBM Plex Mono';margin-left:6px;}
  .badge-ok{background:var(--teal-soft);color:var(--teal);}
  .badge-warn{background:#FBEFE3;color:var(--amber);}
  .data-warning{display:inline-flex;align-items:center;justify-content:center;margin-left:6px;color:var(--amber);font-size:12px;cursor:help;}
  .empty{padding:60px 0;text-align:center;color:var(--slate);}
  .dash{color:var(--slate);}

  /* toggle switch */
  .switch{position:relative;display:inline-block;width:44px;height:24px;}
  .del-btn{
    border:1px solid var(--line);background:#fff;border-radius:var(--radius);
    padding:6px 10px;cursor:pointer;font-size:14px;color:var(--slate);
  }
  .del-btn:hover{border-color:#B33A3A;color:#B33A3A;background:#FBEFEF;}
  .invoice-btn{border:0;background:transparent;color:var(--teal);padding:0;cursor:pointer;font:inherit;text-decoration:underline;white-space:nowrap;}
  .invoice-btn:disabled{opacity:.5;cursor:wait;}
  .topup-switch{display:block;margin-top:6px;}
  .handson-day-select{min-width:130px;padding:6px 8px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;color:var(--ink);font:inherit;}
  .switch input{opacity:0;width:0;height:0;}
  .slider{position:absolute;cursor:pointer;inset:0;background:#D6D8E0;transition:.2s;border-radius:999px;}
  .slider::before{position:absolute;content:"";height:18px;width:18px;left:3px;top:3px;background:#fff;transition:.2s;border-radius:50%;}
  .switch input:checked + .slider{background:var(--teal);}
  .switch input:checked + .slider::before{transform:translateX(20px);}
  .switch-disabled{opacity:.42;}
  .switch-disabled .slider{cursor:not-allowed;}
  .row-paid{background:#F3F8F7;}

  .note{font-size:12.5px;color:var(--slate);margin-top:24px;line-height:1.6;max-width:760px;}
  .table-scroll{overflow-x:auto;border:1px solid var(--line);}