:root{
  --ink:#14232B;
  --ink-soft:#4B5D63;
  --paper:#F2F6F4;
  --card:#FFFFFF;
  --line:#DBE3E0;
  --teal:#0F5257;
  --teal-dark:#0A3B3F;
  --teal-tint:#E3EFEE;
  --amber:#E8A33D;
  --amber-tint:#FBF0DC;
  --rust:#C2483D;
  --rust-tint:#F9E6E3;
  --radius:14px;
  --font-display:'Barlow Condensed', sans-serif;
  --font-body:'IBM Plex Sans Thai','IBM Plex Sans', sans-serif;
  --font-mono:'IBM Plex Mono', monospace;
  --shadow:0 1px 2px rgba(20,35,43,.06), 0 4px 14px rgba(20,35,43,.06);
}

*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  -webkit-font-smoothing:antialiased;
  min-height:100vh;
}
button, input, select{font-family:inherit;}
h1,h2{font-family:var(--font-display); letter-spacing:.01em; margin:0;}

/* ===== Barcode signature mark ===== */
.barcode-mark{
  display:inline-block;
  width:34px; height:28px;
  background:repeating-linear-gradient(
    90deg,
    var(--paper) 0 2px,
    transparent 2px 3px,
    var(--paper) 3px 5px,
    transparent 5px 6px,
    var(--paper) 6px 9px,
    transparent 9px 10px,
    var(--paper) 10px 11px,
    transparent 11px 13px
  );
  background-color:var(--ink);
  border-radius:3px;
  flex:none;
}
.barcode-divider{
  height:22px;
  background:repeating-linear-gradient(
    90deg, var(--teal) 0 2px, transparent 2px 4px,
    var(--teal) 4px 5px, transparent 5px 8px,
    var(--teal) 8px 9px, transparent 9px 12px,
    var(--teal) 12px 14px, transparent 14px 16px
  );
  opacity:.5;
  margin:6px 0 18px;
  border-radius:2px;
}

/* ===== App shell ===== */
#app{display:flex; flex-direction:column; min-height:100vh;}

.topbar{
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 18px; background:var(--ink); color:#fff;
  position:sticky; top:0; z-index:20;
}
.topbar__brand{display:flex; align-items:center; gap:12px;}
.topbar__title{display:flex; flex-direction:column; line-height:1.15;}
.topbar__title strong{font-family:var(--font-display); font-size:22px; letter-spacing:.02em;}
.topbar__title span{font-size:11px; color:#B9C9C6;}
.topbar__status{font-size:12px; color:#8FD9C4; font-family:var(--font-mono);}

.content{
  flex:1; width:100%; max-width:1100px; margin:0 auto;
  padding:20px 16px 90px;
}

.view-title{
  font-size:30px; font-weight:700; margin-bottom:4px;
}

/* ===== Stat cards ===== */
.stat-grid{
  display:grid; grid-template-columns:repeat(2,1fr); gap:12px;
  margin:14px 0 20px;
}
.stat-grid--3{grid-template-columns:repeat(2,1fr);}
.stat-card{
  background:var(--card); border-radius:var(--radius); padding:16px;
  box-shadow:var(--shadow); border-left:5px solid var(--teal);
  display:flex; flex-direction:column; gap:6px;
}
.stat-card--teal{border-color:var(--teal);}
.stat-card--amber{border-color:var(--amber);}
.stat-card--navy{border-color:var(--ink);}
.stat-card--rust{border-color:var(--rust);}
.stat-card__label{font-size:12.5px; color:var(--ink-soft);}
.stat-card__value{font-family:var(--font-mono); font-size:26px; font-weight:600;}
.stat-card__value--text{font-family:var(--font-body); font-size:16px; font-weight:600;}

/* ===== Panels ===== */
.panel{
  background:var(--card); border-radius:var(--radius); box-shadow:var(--shadow);
  padding:18px; margin-bottom:18px;
}
.panel__head{display:flex; align-items:baseline; justify-content:space-between; gap:8px; margin-bottom:10px; flex-wrap:wrap;}
.panel__head h2{font-size:20px;}
.hint{font-size:12px; color:var(--ink-soft);}

/* ===== Toolbar / forms ===== */
.toolbar{display:flex; gap:8px; margin-bottom:14px; flex-wrap:wrap;}
.toolbar--wrap{align-items:flex-end;}
.toolbar input[type=search]{flex:1; min-width:160px;}

input, select{
  border:1px solid var(--line); border-radius:9px; padding:9px 11px;
  font-size:14px; background:#fff; color:var(--ink); width:100%;
}
input:focus, select:focus{outline:2px solid var(--teal); outline-offset:1px;}

.field{display:flex; flex-direction:column; gap:5px; font-size:12.5px; color:var(--ink-soft); font-weight:600;}
.field--wide{grid-column:1 / -1;}
.form-grid{
  display:grid; grid-template-columns:repeat(2,1fr); gap:12px 14px; align-items:end;
}
.scan-input{display:flex; gap:6px;}
.scan-input select, .scan-input input{flex:1;}

.btn{
  border:none; border-radius:9px; padding:10px 16px; font-size:14px; font-weight:600;
  cursor:pointer; transition:transform .05s ease, opacity .15s ease;
}
.btn:active{transform:scale(.97);}
.btn--primary{background:var(--teal); color:#fff;}
.btn--primary:hover{background:var(--teal-dark);}
.btn--ghost{background:var(--teal-tint); color:var(--teal-dark);}
.btn--danger{background:var(--rust-tint); color:var(--rust);}
.btn--block{width:100%; margin-top:10px;}
.btn--icon{padding:9px 12px; flex:none;}

/* ===== Tables ===== */
.table-wrap{overflow-x:auto;}
.data-table{width:100%; border-collapse:collapse; font-size:13.5px; min-width:520px;}
.data-table th{
  text-align:left; font-size:11px; text-transform:uppercase; letter-spacing:.04em;
  color:var(--ink-soft); padding:8px 10px; border-bottom:2px solid var(--line);
}
.data-table td{padding:9px 10px; border-bottom:1px solid var(--line); vertical-align:middle;}
.data-table tbody tr:hover{background:var(--teal-tint);}
.mono{font-family:var(--font-mono);}
.tag{display:inline-block; padding:2px 8px; border-radius:99px; font-size:11px; font-weight:700;}
.tag--low{background:var(--amber-tint); color:#8a5a10;}
.tag--out{background:var(--rust-tint); color:var(--rust);}
.tag--in{background:var(--teal-tint); color:var(--teal-dark);}
.link-btn{background:none; border:none; color:var(--teal-dark); font-weight:700; cursor:pointer; padding:4px 6px;}
.empty-state{text-align:center; color:var(--ink-soft); font-size:13px; padding:22px 10px;}

/* ===== POS ===== */
.pos-layout{display:grid; grid-template-columns:1fr; gap:16px;}
.pos-product-grid{
  display:grid; grid-template-columns:repeat(2,1fr); gap:10px; max-height:420px; overflow-y:auto;
}
.pos-product{
  background:var(--paper); border:1px solid var(--line); border-radius:10px; padding:10px;
  text-align:left; cursor:pointer; display:flex; flex-direction:column; gap:4px;
}
.pos-product:hover{border-color:var(--teal);}
.pos-product strong{font-size:13.5px;}
.pos-product span{font-size:12px; color:var(--ink-soft); font-family:var(--font-mono);}
.cart-total{
  display:flex; justify-content:space-between; align-items:center; font-size:16px;
  padding-top:10px; border-top:2px dashed var(--line); margin-top:6px;
}
.cart-total strong{font-family:var(--font-mono); font-size:22px; color:var(--teal-dark);}

/* ===== Auth screen ===== */
.auth-screen{
  position:fixed; inset:0; z-index:100; background:var(--ink);
  display:flex; align-items:center; justify-content:center; padding:20px;
}
.auth-card{
  background:#fff; border-radius:var(--radius); padding:26px 22px; width:100%; max-width:380px;
  box-shadow:var(--shadow);
}
.auth-brand{display:flex; align-items:center; gap:12px; margin-bottom:4px;}
.auth-form{display:flex; flex-direction:column; gap:14px; margin-top:14px;}
.auth-error{
  margin-top:14px; background:var(--rust-tint); color:var(--rust); padding:9px 12px;
  border-radius:9px; font-size:13px; text-align:center;
}

/* ===== Topbar user menu ===== */
.topbar__user{display:flex; align-items:center; gap:8px;}
.topbar__username{
  background:none; border:none; color:#fff; font-size:12.5px; cursor:pointer;
  display:flex; align-items:center; gap:5px;
}
.btn--small{padding:7px 12px; font-size:12.5px;}

/* ===== Scan modal (manual entry first, camera optional) ===== */
.scan-manual{display:flex; gap:8px;}
.scan-manual input{flex:1;}
.scan-divider{
  display:flex; align-items:center; gap:10px; margin:16px 0; color:var(--ink-soft); font-size:12px;
}
.scan-divider::before, .scan-divider::after{content:''; flex:1; height:1px; background:var(--line);}
#scanReader{margin-top:10px;}

/* ===== Modal ===== */
.modal{
  position:fixed; inset:0; background:rgba(20,35,43,.55); z-index:50;
  display:flex; align-items:flex-end; justify-content:center;
}
.modal__box{
  background:#fff; width:100%; max-width:560px; border-radius:18px 18px 0 0;
  padding:18px; max-height:92vh; overflow-y:auto;
}
.modal__box--scan{max-width:420px;}
.modal__head{display:flex; justify-content:space-between; align-items:center; margin-bottom:14px;}
.modal__close{background:none; border:none; font-size:18px; cursor:pointer; color:var(--ink-soft);}
.modal__actions{grid-column:1/-1; display:flex; justify-content:space-between; gap:10px; margin-top:6px;}
#scanReader{width:100%; border-radius:10px; overflow:hidden;}

/* ===== Toast ===== */
.toast{
  position:fixed; bottom:80px; left:50%; transform:translateX(-50%);
  background:var(--ink); color:#fff; padding:10px 18px; border-radius:99px;
  font-size:13px; z-index:80; box-shadow:var(--shadow);
}

/* ===== Bottom tab bar (mobile) ===== */
.tabbar{
  position:fixed; bottom:0; left:0; right:0; z-index:30;
  display:flex; background:#fff; border-top:1px solid var(--line);
  padding:6px 4px calc(6px + env(safe-area-inset-bottom));
  box-shadow:0 -2px 10px rgba(20,35,43,.06);
}
.tabbar__item{
  flex:1; display:flex; flex-direction:column; align-items:center; gap:2px;
  background:none; border:none; font-size:10.5px; color:var(--ink-soft); padding:6px 2px; border-radius:10px;
}
.tabbar__item span{font-size:19px;}
.tabbar__item.is-active{color:var(--teal-dark); background:var(--teal-tint); font-weight:700;}

.view[hidden]{display:none;}

/* ===== Desktop layout ===== */
@media (min-width:900px){
  #app{flex-direction:row;}
  .tabbar{
    position:sticky; top:0; height:100vh; left:0; flex-direction:column;
    width:210px; border-top:none; border-right:1px solid var(--line);
    padding:22px 12px; gap:6px; box-shadow:none;
  }
  .tabbar__item{flex-direction:row; justify-content:flex-start; gap:10px; font-size:14px; padding:11px 12px;}
  .tabbar__item span{font-size:18px;}
  .content{padding:28px 34px 40px; max-width:1000px;}
  .form-grid{grid-template-columns:repeat(3,1fr);}
  .stat-grid{grid-template-columns:repeat(4,1fr);}
  .stat-grid--3{grid-template-columns:repeat(3,1fr);}
  .pos-layout{grid-template-columns:1.3fr 1fr;}
  .pos-product-grid{grid-template-columns:repeat(3,1fr);}
  .modal{align-items:center;}
  .modal__box{border-radius:18px;}
}

.auth-screen[hidden] {
  display: none !important;
}

[hidden] {
  display: none !important;
}