:root{
  --pine:#214a2c; --pine-2:#2c5e3a; --green:#357e53; --gold:#ac8c45; --gold-2:#c9a85c;
  --ink:#1e2b22; --muted:#5c6b60; --cream:#f3f1e1; --paper:#fbfaf3; --line:#e2dfcc;
  --red:#b3261e; --amber-bg:#fff6e0; --amber:#8a6a24; --radius:16px;
  --font:"Be Vietnam Pro",-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);color:var(--ink);background:var(--cream);line-height:1.5;font-size:16px}
a{color:var(--green)}
button,input,select,textarea{font:inherit;color:inherit}
.hidden{display:none!important}

/* Đầu trang */
.band{background:var(--pine);color:#fff;padding:22px 18px 26px}
.band .wrap{max-width:760px;margin:0 auto}
.band .kicker{font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;color:var(--gold-2);font-weight:600}
.band h1{margin:4px 0 2px;font-size:1.35rem;line-height:1.3}
.band .when{color:#d8e4da;font-size:.92rem}
main{max-width:760px;margin:0 auto;padding:18px 16px 60px}
.wide main,.wide .band .wrap{max-width:1180px}

/* Thẻ */
.card{background:#fff;border-radius:var(--radius);padding:20px;box-shadow:0 1px 0 rgba(0,0,0,.04),0 6px 22px rgba(33,74,44,.07);margin-bottom:16px}
.card h2{margin:0 0 10px;font-size:1.12rem}
.muted{color:var(--muted)}
.small{font-size:.86rem}
.center{text-align:center}

/* Form */
label{display:block;font-weight:600;font-size:.92rem;margin:12px 0 6px}
input[type=text],input[type=tel],input[type=email],input[type=password],input[type=number],input[type=url],select,textarea{
  width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:12px;background:var(--paper);outline:none}
input:focus,select:focus,textarea:focus{border-color:var(--green);background:#fff}
textarea{min-height:110px;resize:vertical}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:12px;padding:12px 18px;
  background:var(--green);color:#fff;font-weight:600;cursor:pointer;text-decoration:none}
.btn:hover{background:var(--pine-2)}
.btn:disabled{opacity:.55;cursor:wait}
.btn.block{width:100%;padding:14px}
.btn.ghost{background:transparent;color:var(--pine);border:1.5px solid var(--line)}
.btn.ghost:hover{background:var(--paper)}
.btn.gold{background:var(--gold)}
.btn.danger{background:#fff;color:var(--red);border:1.5px solid #e9c3c0}
.btn.sm{padding:7px 12px;font-size:.86rem;border-radius:10px}
.msg{margin-top:12px;padding:12px 14px;border-radius:12px;font-size:.92rem}
.msg.err{background:#fdecea;color:var(--red)}
.msg.ok{background:#e8f3ec;color:var(--pine)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{border:1.5px solid var(--line);background:var(--paper);border-radius:999px;padding:7px 13px;font-size:.88rem;cursor:pointer}
.chip.on{background:var(--pine);border-color:var(--pine);color:#fff}

/* Chào + số bàn */
.hello{display:flex;gap:14px;align-items:center}
.tick{flex:0 0 44px;height:44px;border-radius:50%;background:#e8f3ec;color:var(--green);display:grid;place-items:center;font-size:1.4rem;font-weight:700}
.hello h2{margin:0;font-size:1.2rem}
.table-badge{background:var(--pine);color:#fff;border-radius:var(--radius);padding:18px;text-align:center;margin-bottom:16px}
.table-badge .lbl{font-size:.8rem;letter-spacing:.12em;text-transform:uppercase;color:var(--gold-2);font-weight:600}
.table-badge .num{font-size:4rem;font-weight:800;line-height:1;margin:4px 0}
.table-badge .sub{color:#d8e4da;font-size:.9rem}

/* Thẻ mentor */
.mentors{display:grid;gap:14px}
@media(min-width:640px){.mentors{grid-template-columns:1fr 1fr}}
.mentor{background:#fff;border-radius:var(--radius);overflow:hidden;box-shadow:0 6px 22px rgba(33,74,44,.08);display:flex;flex-direction:column}
.mentor .ph{aspect-ratio:1/1;background:var(--cream) center/cover no-repeat}
.mentor .bd{padding:16px}
.mentor .field{font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--gold);font-weight:700}
.mentor h3{margin:4px 0 2px;font-size:1.08rem}
.mentor .ttl{font-size:.88rem;color:var(--muted)}
.mentor .ask{margin:12px 0 0;padding:12px 14px;background:var(--paper);border-radius:12px}
.mentor .ask b{display:block;font-size:.8rem;color:var(--pine);margin-bottom:4px}
.mentor .ask ul{margin:0;padding-left:18px;font-size:.9rem}
.mentor .more{margin-top:12px;font-size:.88rem;font-weight:600}

/* Danh sách */
.list{list-style:none;margin:0;padding:0}
.list li{padding:12px 0;border-top:1px solid var(--line)}
.list li:first-child{border-top:0}
.q .meta{font-size:.8rem;color:var(--muted)}
.tag{display:inline-block;font-size:.74rem;padding:2px 9px;border-radius:999px;background:#e8f3ec;color:var(--pine);font-weight:600;margin-right:6px}
.tag.gold{background:#f6eedb;color:#7c6224}
.tag.grey{background:#eee;color:#555}
.tag.red{background:#fdecea;color:var(--red)}
.mates{columns:2;column-gap:16px;font-size:.92rem;margin:0;padding-left:18px}

/* Quản trị */
.tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:16px}
.tabs button{border:0;background:#fff;border-radius:10px;padding:9px 14px;font-weight:600;color:var(--muted);cursor:pointer}
.tabs button.on{background:var(--pine);color:#fff}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:16px}
.stat{background:#fff;border-radius:14px;padding:14px 16px}
.stat .n{font-size:1.8rem;font-weight:800;color:var(--pine)}
.stat .l{font-size:.84rem;color:var(--muted)}
.toolbar{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:12px}
.toolbar input[type=text]{max-width:260px}
.tbl-wrap{overflow:auto;background:#fff;border-radius:14px}
table.tbl{border-collapse:collapse;width:100%;font-size:.88rem}
.tbl th,.tbl td{padding:8px 10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.tbl th{background:var(--paper);position:sticky;top:0;font-size:.8rem;color:var(--muted);white-space:nowrap}
.tbl select,.tbl input{padding:6px 8px;border-radius:8px;font-size:.86rem;width:auto}
.tbl tr.off td{opacity:.45}
.tables-grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}
.tcard{background:#fff;border-radius:14px;padding:14px}
.tcard h3{margin:0 0 8px;display:flex;justify-content:space-between;align-items:center}
.tcard select{margin-bottom:6px;padding:8px 10px;font-size:.88rem}
.tcard ol{margin:8px 0 0;padding-left:20px;font-size:.88rem}
.tcard ol li{margin:2px 0}
.qr-box{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.qr-box .card{text-align:center}
.qr-box svg{width:220px;height:220px}
.lock{background:var(--amber-bg);border:1.5px dashed #c8a23c;color:var(--amber);padding:10px 14px;border-radius:12px;margin-bottom:12px;font-size:.9rem}
dialog{border:0;border-radius:16px;padding:0;max-width:640px;width:calc(100% - 24px)}
dialog::backdrop{background:rgba(20,40,25,.45)}
dialog .card{margin:0;box-shadow:none}
.grid2{display:grid;gap:0 14px}
@media(min-width:640px){.grid2{grid-template-columns:1fr 1fr}}

/* In mã QR */
#print-area{display:none}
@media print{
  body{background:#fff}
  body>*:not(#print-area){display:none!important}
  #print-area{display:block}
  .print-qr{page-break-after:always;text-align:center;padding:40px 20px;font-family:var(--font)}
  .print-qr h1{font-size:28px;margin:0 0 6px;color:#214a2c}
  .print-qr p{font-size:18px;margin:0 0 24px}
  .print-qr svg{width:420px;height:420px}
  .print-qr .url{font-size:14px;color:#555;margin-top:12px}
}