:root{
  --ink:#16181d; --ink2:#494e58; --ink3:#7b818d;
  --bg:#eceef2; --card:#fff; --line:#dee0e6; --line2:#eceef1; --zebra:#f9fafb;
  --burg:#7b1220; --burg-d:#5a0d18; --burg-l:#f7eaec;
  --gold:#a8811f; --gold-l:#fdf6e3;
  --ok:#1b6b45; --ok-l:#e7f3ec;
  --warn:#9a5600; --warn-l:#fdf0dc;
  --r:9px; --rs:5px;
  --sh1:0 1px 2px rgba(16,18,24,.07),0 1px 1px rgba(16,18,24,.04);
  --sh2:0 1px 2px rgba(16,18,24,.06),0 7px 18px rgba(16,18,24,.08);
  --sh3:0 20px 56px rgba(16,18,24,.3);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--ink);
  font:15px/1.5 "Segoe UI",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;-webkit-font-smoothing:antialiased}
h4{margin:0}
p{margin:0}

/* ---------- thanh trên ---------- */
.topbar{display:flex;align-items:center;gap:20px;flex-wrap:wrap;padding:10px 18px;color:#fff;
  background:linear-gradient(180deg,#8c1526,#6c101f);box-shadow:0 2px 10px rgba(60,8,16,.32)}
.brand{display:flex;align-items:center;gap:12px;margin-right:auto}
.mark{width:44px;height:44px;border-radius:10px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.3);
  display:grid;place-items:center;overflow:hidden;cursor:pointer;flex:0 0 auto}
.mark:hover{background:rgba(255,255,255,.24)}
.mark img{width:100%;height:100%;object-fit:contain;display:none;background:#fff}
.mark img.on{display:block}
.mark span{font-size:11px;font-weight:700;letter-spacing:.04em;color:#f6dc9c}
.t1{font-size:15.5px;font-weight:650}
.t2{font-size:12px;color:#eec8ce}
.modes{display:flex;gap:4px;background:rgba(0,0,0,.2);padding:3px;border-radius:var(--r)}
.mode{font:inherit;font-size:13.5px;padding:7px 14px;border:0;border-radius:6px;cursor:pointer;
  background:transparent;color:#e9c6cc}
.mode:hover{color:#fff}
.mode.active{background:#fff;color:var(--burg);font-weight:650}

/* ---------- trạng thái ---------- */
.status{padding:9px 18px;font-size:13.5px;background:#fff;border-bottom:1px solid var(--line);color:var(--ink2)}
.status.ok{background:var(--ok-l);color:var(--ok);font-weight:600}
.status.er{background:var(--burg-l);color:var(--burg);font-weight:600}
.status.busy{background:var(--gold-l);color:var(--warn);font-weight:600}

main{padding:16px 18px 40px;max-width:1500px;margin:0 auto}
.hidden{display:none!important}
.split{display:grid;grid-template-columns:minmax(0,1fr) 470px;gap:18px;align-items:start}
.col-left{display:grid;gap:16px}

/* ---------- thẻ khối ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--sh2);overflow:hidden}
.card.sticky{position:sticky;top:14px}
.card-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:11px 15px;
  background:linear-gradient(180deg,#f6f7f9,#edeff3);border-bottom:1px solid var(--line);font-size:14px;font-weight:650}
.card-body{padding:15px;display:grid;gap:12px}
.tag{font-size:11.5px;font-weight:400;color:var(--ink3);background:#fff;border:1px solid var(--line);
  padding:2px 8px;border-radius:10px}
.sec{font-size:13.5px;font-weight:650;color:var(--ink2);margin-top:6px}
.hint{color:var(--ink3);font-size:12.5px}
.hint.ok{color:var(--ok);font-weight:600}
.hint.warn{color:var(--warn);font-weight:600}

/* ---------- nút ---------- */
.btn{font:inherit;font-size:13.5px;padding:8px 14px;border-radius:var(--rs);cursor:pointer;white-space:nowrap;
  border:1px solid var(--line);background:linear-gradient(180deg,#fff,#f5f6f8);color:var(--ink);box-shadow:var(--sh1);
  display:inline-flex;align-items:center;justify-content:center;gap:6px;text-decoration:none}
.btn:hover{border-color:#c1c5cd;background:#fff}
.btn:active{transform:translateY(1px);box-shadow:none}
.btn.sm{font-size:12.5px;padding:5px 11px}
.btn.xs{font-size:12px;padding:4px 9px}
.btn.wide{width:100%}
.btn.grow{flex:1}
.btn.primary{background:linear-gradient(180deg,#8c1526,#6e1020);border-color:#5a0d18;color:#fff;font-weight:650}
.btn.primary:hover{background:linear-gradient(180deg,#9a1a2c,#7b1220)}
.btn.ghost{background:#fff;color:var(--ink2)}
.btn.danger{color:var(--burg);border-color:#e4c2c7}
.btn.danger:hover{background:var(--burg-l)}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none}
.x{border:0;background:none;color:#f3d3d7;cursor:pointer;font-size:22px;line-height:1;padding:0 6px;border-radius:5px}
.x:hover{color:#fff;background:rgba(255,255,255,.16)}

.row{display:flex;gap:9px;flex-wrap:wrap;align-items:flex-end}

/* ---------- ô nhập ---------- */
.fld{display:grid;gap:4px;font-size:12px;color:var(--ink2)}
.fld>span{font-weight:600}
.fld input,.fld select,.fld textarea,select,input[type=text]{font:inherit;font-size:13.5px;padding:7px 9px;
  border:1px solid var(--line);border-radius:var(--rs);background:#fff;width:100%}
.fld textarea{line-height:1.5;resize:vertical}
input:focus,select:focus,textarea:focus{outline:2px solid var(--gold);outline-offset:1px}
.ck{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--ink2);cursor:pointer}
.ck input{width:17px;height:17px;cursor:pointer;accent-color:var(--burg)}
.form{display:grid;gap:9px}

.sliders{display:none;flex-direction:column;gap:10px;background:var(--zebra);border:1px solid var(--line2);
  border-radius:var(--rs);padding:12px}
.sliders label{display:flex;align-items:center;gap:12px;font-size:12.5px;color:var(--ink2);font-weight:600}
.sliders label>span{width:86px;flex:0 0 auto}
.sliders input[type=range]{flex:1;accent-color:var(--burg)}
.sliders label.ck>span{width:auto}

/* ---------- hai ô mặt thẻ ---------- */
.slots{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.slot{border:1px solid var(--line);border-radius:var(--r);background:var(--zebra);padding:10px;display:grid;gap:8px}
.slot-label{font-size:11.5px;font-weight:700;letter-spacing:.03em;color:var(--ink2)}
.slot img{width:100%;aspect-ratio:1.5858;object-fit:contain;background:#fff;border:1px solid var(--line2);
  border-radius:var(--rs);display:none}
.slot-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;
  aspect-ratio:1.5858;background:#fff;border:1.5px dashed #ccd0d7;border-radius:var(--rs);color:var(--ink3);font-size:12.5px}
.slot-tools{display:none;gap:5px;flex-wrap:wrap;justify-content:center}

/* ---------- xem trước A4 ---------- */
.preview-wrap{background:#4c5057;padding:14px;max-height:62vh;overflow:auto}
.a4{background:#fff;box-shadow:0 3px 18px rgba(0,0,0,.35);line-height:0}
.a4 canvas{display:block;width:100%;height:auto}
.dlbox{display:none;padding:11px;background:var(--gold-l);border:1px solid #e6d3a0;border-radius:var(--rs);font-size:13px}
.dlbox .btn{margin-top:6px}
.mailnote{margin-bottom:8px;line-height:1.5}

/* ---------- chế độ tài liệu ---------- */
.editor-wrap{background:var(--zebra);border:1px solid var(--line2);border-radius:var(--r);padding:12px;display:grid;gap:10px}
#dCanvas{max-width:100%;display:block;margin:0 auto;border-radius:var(--rs);background:#fff;
  touch-action:none;cursor:crosshair;border:1px solid var(--line)}
.out-canvas{max-width:100%;display:block;margin:0 auto;border-radius:var(--rs);border:1px dashed var(--line);background:#fff}
.gallery{display:flex;gap:18px;overflow-x:auto;padding:14px 6px 8px}
.thumb-wrap{position:relative;flex:0 0 auto;width:96px}
.thumb{width:96px;height:96px;object-fit:contain;background:#fff;border:3px solid transparent;
  border-radius:var(--r);cursor:pointer;box-shadow:var(--sh1)}
.thumb.active{border-color:var(--burg)}
.thumb.done{border-color:var(--ok)}
.badge{position:absolute;top:-9px;left:-9px;width:28px;height:28px;border-radius:50%;border:2px solid #fff;
  background:#e7e9ee;color:var(--ink2);font:inherit;font-size:13px;font-weight:700;cursor:pointer;box-shadow:var(--sh1)}
.badge.on{background:var(--burg);color:#fff}
.badge:disabled{opacity:.5;cursor:default}
.thumb-x{position:absolute;top:-9px;right:-9px;width:24px;height:24px;border-radius:50%;border:2px solid #fff;
  background:#fff;color:var(--burg);font-size:15px;line-height:1;cursor:pointer;box-shadow:var(--sh1)}
.empty{color:var(--ink3);font-size:13px;padding:22px;text-align:center;background:var(--zebra);
  border:1px dashed var(--line);border-radius:var(--rs)}

/* ---------- hộp thoại ---------- */
.modal{position:fixed;inset:0;background:rgba(18,20,26,.62);display:grid;place-items:center;z-index:100;padding:18px}
.modal.hidden{display:none}
.modal-box{background:#fff;border-radius:12px;box-shadow:var(--sh3);width:min(920px,100%);max-height:90vh;
  display:flex;flex-direction:column;overflow:hidden}
.modal-head{display:flex;align-items:center;justify-content:space-between;padding:13px 17px;
  background:linear-gradient(180deg,#8c1526,#6e1020);color:#fff}
.modal-body{padding:15px 17px;overflow:auto;display:grid;gap:11px}
.modal-foot{padding:12px 17px;border-top:1px solid var(--line2);display:flex;justify-content:flex-end;gap:9px;background:var(--zebra)}
#cropCanvas{max-width:100%;display:block;margin:0 auto;touch-action:none;cursor:crosshair;
  border-radius:var(--rs);border:1px solid var(--line)}
#camVideo{width:100%;max-height:56vh;background:#000;border-radius:var(--rs);display:block}

.toast{position:fixed;left:50%;bottom:22px;transform:translateX(-50%);background:#1b1d23;color:#fff;
  padding:11px 18px;border-radius:var(--r);font-size:13.5px;z-index:130;max-width:84vw;box-shadow:var(--sh3)}
.toast.hidden{display:none}
.toast.er{background:var(--burg)}

.foot{text-align:center;padding:18px;color:var(--ink3);font-size:12.5px}

@media (max-width:1080px){
  .split{grid-template-columns:1fr}
  .card.sticky{position:static}
  .preview-wrap{max-height:none}
}
@media (max-width:640px){
  main{padding:12px 10px 40px}
  .topbar{gap:12px;padding:9px 12px}
  .t1{font-size:14px}
  .card-body{padding:12px}
  .slots{grid-template-columns:1fr}
  .btn{padding:9px 13px}
  .row .btn,.row .fld{width:100%;flex:1 1 100%}
  .modes{width:100%}
  .mode{flex:1}
}
@media print{
  .topbar,.status,.modes,.col-left,.card-head,.card-body,.foot,.toast,.modal{display:none!important}
  main{padding:0;max-width:none}
  .split{display:block}
  .card{border:0;box-shadow:none}
  .preview-wrap{background:#fff;padding:0;max-height:none;overflow:visible}
  .a4{box-shadow:none}
}

/* ============================================================
   CÀI LÊN ĐIỆN THOẠI VÀ GIAO DIỆN CẦM TAY
   ============================================================ */

.btn.install{background:rgba(255,255,255,.16);border-color:rgba(255,255,255,.4);color:#fff;font-weight:650}
.btn.install:hover{background:rgba(255,255,255,.28)}
.offline-bar{padding:7px 18px;background:var(--ok-l);color:var(--ok);font-size:12.5px;font-weight:600;
  border-bottom:1px solid #bfdccd}

/* thanh dưới màn hình — mặc định ẩn, chỉ bật ở màn hình hẹp */
.bottombar{display:none}
.sheet-close{display:none}

@media (max-width:1080px){
  .bottombar{
    display:grid;grid-template-columns:repeat(3,1fr);gap:0;
    position:fixed;left:0;right:0;bottom:0;z-index:90;
    background:#fff;border-top:1px solid var(--line);
    box-shadow:0 -3px 14px rgba(16,18,24,.12);
    padding-bottom:env(safe-area-inset-bottom)
  }
  .bb{position:relative;font:inherit;border:0;background:none;cursor:pointer;color:var(--ink2);
    display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
    padding:9px 4px 8px;font-size:11.5px;font-weight:600;min-height:58px}
  .bb .ic{font-size:21px;line-height:1}
  .bb:active{background:var(--burg-l)}
  .bb:disabled{opacity:.4}
  .bb .dot{position:absolute;top:7px;right:calc(50% - 26px);width:9px;height:9px;border-radius:50%;
    background:var(--ok);border:2px solid #fff}
  main{padding-bottom:78px}
  .foot{padding-bottom:76px}

  /* xem trang A4 dạng tấm phủ toàn màn hình */
  .col-right{display:none}
  body.sheet-open .col-right{
    display:block;position:fixed;inset:0;z-index:95;background:var(--bg);
    overflow:auto;padding:10px 10px calc(78px + env(safe-area-inset-bottom))
  }
  body.sheet-open .col-right .card{box-shadow:none}
  body.sheet-open{overflow:hidden}
  .sheet-close{display:inline-flex}
  .preview-wrap{max-height:none}
}

@media (max-width:640px){
  /* nút chụp to, dễ bấm khi đang cầm thẻ */
  #btnCapBoth{min-height:52px;font-size:15px;font-weight:700}
  .slot-empty{gap:10px;padding:10px}
  .slot-empty .btn{min-height:38px}
  .slot-tools .btn{min-height:34px;flex:1}
  .bb{font-size:11px}
  .topbar .btn.install{padding:6px 10px;font-size:12px}
  .modes{order:3;width:100%}
}

/* màn hình rất hẹp: hai ô thẻ vẫn nằm cạnh nhau cho đỡ phải cuộn */
@media (max-width:640px) and (min-width:380px){
  .slots{grid-template-columns:1fr 1fr;gap:8px}
  .slot{padding:7px}
  .slot-empty{font-size:11.5px}
}

/* đầu trang gọn lại trên điện thoại cho đỡ tốn chỗ cuộn */
.t1 .short,.btn.install .short{display:none}

@media (max-width:760px){
  .topbar{gap:8px;padding:8px 12px;flex-wrap:wrap}
  .brand{gap:9px;min-width:0;flex:1 1 auto}
  .t1{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .mark{width:36px;height:36px;border-radius:8px}
  .mark span{font-size:9.5px}
  .t1{font-size:15.5px;line-height:1.25}
  .t1 .long,.btn.install .long{display:none}
  .t1 .short,.btn.install .short{display:inline}
  .t2{display:none}
  .btn.install{flex:0 0 auto}
  .modes{order:3;width:100%;margin-top:2px}
  .mode{flex:1;padding:8px 6px;font-size:13px}
  .status{padding:7px 12px;font-size:12.5px}
  .offline-bar{padding:6px 12px;font-size:12px}
  .card-head{padding:9px 12px;font-size:13.5px}
  .card-body{gap:10px}
  .hint{font-size:12px;line-height:1.45}
  .slot-tools{gap:4px}
  .slot-tools .btn{padding:5px 6px;font-size:11.5px}
}