:root{
  --bg:#f5f7f6; --card:#fff; --ink:#1d2925; --muted:#66756f; --line:#e1e7e4;
  --brand:#2e8b57; --brand-d:#23704a; --brand-l:#e7f4ec;
  --ok:#1f8a4c; --ok-l:#e3f5ea; --warn:#a86a00; --warn-l:#fff3d9; --bad:#c0392b; --bad-l:#fde8e6; --mute-l:#eef1f0;
  --radius:10px; --shadow:0 1px 2px rgba(0,0,0,.05),0 2px 8px rgba(0,0,0,.04);
  font-family:"Segoe UI",system-ui,-apple-system,"Noto Sans Khmer","Khmer OS",sans-serif;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font-size:15px;line-height:1.45}
a{color:var(--brand-d)}
h1{font-size:1.45rem;margin:0 0 .6rem} h2{font-size:1.15rem;margin:0 0 .6rem} h3{font-size:1rem;margin:0 0 .5rem}
.muted{color:var(--muted)} small{color:var(--muted)}
.top{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:12px;padding:8px 16px;background:#fff;border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;text-decoration:none;color:var(--ink);margin-right:auto}
.brand img{width:30px;height:30px}
.branch-pick select{padding:6px 8px;border-radius:8px;border:1px solid var(--line);background:var(--brand-l);font-weight:600}
.branch-one{font-weight:600;color:var(--brand-d)}
.usermenu{position:relative} .usermenu summary{cursor:pointer;list-style:none;padding:6px 10px;border-radius:8px;border:1px solid var(--line)}
.usermenu summary small{display:block;font-size:.72rem;line-height:1}
.usermenu>div{position:absolute;right:0;top:110%;background:#fff;border:1px solid var(--line);border-radius:8px;box-shadow:var(--shadow);min-width:170px;padding:6px;display:flex;flex-direction:column}
.usermenu>div a,.usermenu .linkbtn{padding:8px;text-decoration:none;color:var(--ink);text-align:left;border-radius:6px}
.usermenu>div a:hover,.usermenu .linkbtn:hover{background:var(--bg)}
.linkbtn{background:none;border:0;font:inherit;cursor:pointer;width:100%}
.shell{display:flex;min-height:calc(100vh - 50px)}
.side{width:210px;flex:none;background:#fff;border-right:1px solid var(--line);padding:10px 8px;position:sticky;top:50px;height:calc(100vh - 50px);overflow:auto}
.side a{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:8px;color:var(--ink);text-decoration:none;margin-bottom:2px}
.side a i{font-style:normal;width:20px;text-align:center;color:var(--brand)}
.side a:hover{background:var(--bg)} .side a.on{background:var(--brand-l);color:var(--brand-d);font-weight:600}
.side .more{margin-top:12px;border-top:1px solid var(--line);padding-top:10px}
.side .more b{display:block;font-size:.75rem;text-transform:uppercase;color:var(--muted);padding:0 10px 6px;letter-spacing:.04em}
.side .more a{padding:6px 10px;font-size:.92rem}
main{flex:1;min-width:0;padding:18px 22px 60px}
main.solo{max-width:460px;margin:6vh auto;padding:16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px 18px;margin-bottom:16px}
.card.narrow{max-width:460px;margin-left:auto;margin-right:auto}
.login{text-align:center} .login form{text-align:left} .login .logo{width:64px;height:64px}
.head{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:12px}
.head h1{margin:0;margin-right:auto}
.grid{display:grid;gap:14px;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));margin-bottom:16px}
.grid2{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:12px 14px;box-shadow:var(--shadow);text-decoration:none;color:inherit;display:block}
.stat b{display:block;font-size:1.5rem;line-height:1.2;font-variant-numeric:tabular-nums}
.stat span{color:var(--muted);font-size:.85rem}
.stat.bad b{color:var(--bad)} .stat.ok b{color:var(--ok)} .stat.warn b{color:var(--warn)}
label{display:block;margin:0 0 10px;font-weight:600;font-size:.9rem}
input,select,textarea{display:block;width:100%;margin-top:4px;padding:8px 10px;border:1px solid #cfd8d4;border-radius:8px;font:inherit;background:#fff;color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:2px solid var(--brand);outline-offset:0;border-color:var(--brand)}
input[type=checkbox],input[type=radio]{display:inline;width:auto;margin:0 6px 0 0}
textarea{min-height:70px}
.form-row{display:grid;gap:0 14px;grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}
.inline{display:flex;gap:8px;align-items:end;flex-wrap:wrap}
.inline label{margin:0} .inline input,.inline select{width:auto;min-width:140px}
.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border-radius:8px;border:1px solid #cfd8d4;background:#fff;color:var(--ink);font:inherit;font-weight:600;cursor:pointer;text-decoration:none;white-space:nowrap}
.btn:hover{background:var(--bg)}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff} .btn.primary:hover{background:var(--brand-d)}
.btn.danger{color:var(--bad);border-color:#efc2bd} .btn.danger:hover{background:var(--bad-l)}
.btn.sm{padding:4px 9px;font-size:.85rem} .btn.wide{width:100%;justify-content:center;margin-top:6px}
.btn[disabled]{opacity:.5;cursor:not-allowed}
table{width:100%;border-collapse:collapse;font-size:.92rem}
th,td{padding:8px 8px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
th{font-size:.78rem;text-transform:uppercase;letter-spacing:.03em;color:var(--muted);font-weight:700;background:#fafcfb}
tr:hover td{background:#fafcfb}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
td.empty{text-align:center;color:var(--muted);padding:22px}
tfoot td{font-weight:700;background:#fafcfb}
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
.badge{display:inline-block;padding:2px 8px;border-radius:99px;font-size:.78rem;font-weight:700;background:var(--mute-l);color:var(--muted);white-space:nowrap}
.badge.ok{background:var(--ok-l);color:var(--ok)} .badge.warn{background:var(--warn-l);color:var(--warn)} .badge.bad{background:var(--bad-l);color:var(--bad)}
.flash{padding:10px 14px;border-radius:8px;margin-bottom:14px;background:var(--ok-l);color:var(--ok);font-weight:600}
.flash.bad{background:var(--bad-l);color:var(--bad)} .flash.warn{background:var(--warn-l);color:var(--warn)}
.pager{display:flex;gap:10px;align-items:center;justify-content:center;margin-top:12px}
.tabs{display:flex;gap:4px;border-bottom:1px solid var(--line);margin-bottom:14px;flex-wrap:wrap}
.tabs a{padding:8px 12px;text-decoration:none;color:var(--muted);font-weight:600;border-bottom:2px solid transparent}
.tabs a.on{color:var(--brand-d);border-color:var(--brand)}
dl.facts{display:grid;grid-template-columns:max-content 1fr;gap:4px 14px;margin:0}
dl.facts dt{color:var(--muted)} dl.facts dd{margin:0}
.right{text-align:right} .nowrap{white-space:nowrap}
.att{display:flex;gap:4px} .att label{margin:0}
.att input{display:none} .att span{display:inline-block;padding:5px 10px;border:1px solid var(--line);border-radius:6px;cursor:pointer;font-weight:700;color:var(--muted)}
.att input:checked+span.P{background:var(--ok-l);color:var(--ok);border-color:var(--ok)}
.att input:checked+span.A{background:var(--bad-l);color:var(--bad);border-color:var(--bad)}
.att input:checked+span.L{background:var(--warn-l);color:var(--warn);border-color:var(--warn)}
.att input:checked+span.E{background:#e8eefc;color:#3557b7;border-color:#3557b7}
.search-results{border:1px solid var(--line);border-radius:8px;margin-top:4px;max-height:280px;overflow:auto;background:#fff}
.search-results a{display:block;padding:8px 10px;border-bottom:1px solid var(--line);text-decoration:none;color:var(--ink)}
.search-results a:hover{background:var(--brand-l)}
.bar{height:8px;background:var(--line);border-radius:99px;overflow:hidden} .bar i{display:block;height:100%;background:var(--brand)}
.receipt{max-width:380px;margin:0 auto;background:#fff;padding:20px;border:1px dashed #bbb;font-size:14px}
.receipt h2{text-align:center;margin:0} .receipt .c{text-align:center} .receipt table td{padding:4px 2px}
@media (max-width:820px){
  .shell{display:block}
  .side{position:static;width:auto;height:auto;display:flex;overflow-x:auto;gap:2px;padding:6px 8px;border-right:0;border-bottom:1px solid var(--line)}
  .side a{white-space:nowrap;margin:0} .side a i{display:none}
  .side .more{display:flex;border:0;margin:0;padding:0} .side .more b{display:none}
  main{padding:14px 16px 50px}
  .brand span{display:none}
  .top{gap:8px;padding:8px 12px} .usermenu summary small{display:none}
  .hide-sm{display:none}
}
@media print{
  .top,.side,.no-print,.flash{display:none!important}
  main{padding:0} body{background:#fff} .card{box-shadow:none;border:0} .receipt{border:0}
}
.buyer-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.buyer-tabs label{margin:0}
.buyer-tabs input{display:none}
.buyer-tabs span{display:inline-block;padding:9px 14px;border:1px solid var(--line);border-radius:8px;cursor:pointer;font-weight:600;color:var(--muted);background:#fff}
.buyer-tabs input:checked+span{background:var(--brand-l);color:var(--brand-d);border-color:var(--brand)}
.buyer{background:#fafcfb;border:1px solid var(--line);border-radius:8px;padding:10px 12px;margin-bottom:12px}
/* Book covers and stock cards */
.cover{display:inline-block;object-fit:contain;background:#fff;border-radius:6px;box-shadow:0 1px 3px rgba(0,0,0,.15);vertical-align:middle}
.cover-ph{display:inline-flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:.9rem;letter-spacing:.03em;opacity:.85}
.stock-filter{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.stock-filter input[type=search]{width:auto;flex:1;min-width:180px;margin:0}
.chips{display:flex;gap:6px;flex-wrap:wrap}
.chip{border:1px solid var(--line);background:#fff;border-radius:99px;padding:5px 12px;font:inherit;font-size:.85rem;font-weight:600;color:var(--muted);cursor:pointer}
.chip.on{background:var(--brand);border-color:var(--brand);color:#fff}
.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:14px}
.book-card{position:relative;background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:6px}
.book-card.low{border-color:#f2d08a}.book-card.out{border-color:#efc2bd;background:#fffafa}
.book-cover{position:relative;height:150px;display:flex;align-items:center;justify-content:center;background:linear-gradient(#f5f7f6,#fff);border-radius:8px}
.book-cover .cover{width:auto!important;height:130px!important;max-width:100%}
.book-cover .cover-ph{width:96px!important;height:130px!important;font-size:1.4rem}
.book-cover .tag{position:absolute;top:6px;right:6px;font-size:.7rem;font-weight:800;padding:2px 8px;border-radius:99px;color:#fff}
.tag.low{background:var(--warn)}.tag.out{background:var(--bad)}
.book-name{font-weight:700;font-size:.9rem;line-height:1.3;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:2.6em}
.book-meta{display:flex;justify-content:space-between;align-items:baseline}
.book-meta span{color:var(--brand-d);font-weight:800}
.book-meta b{font-size:.85rem;color:var(--ok)}.book-meta b.low{color:var(--warn)}.book-meta b.out{color:var(--bad)}
.book-card .edit{position:absolute;top:8px;left:8px;background:#fff;border:1px solid var(--line);border-radius:6px;padding:0 6px;text-decoration:none;opacity:0;transition:opacity .15s}
.book-card:hover .edit{opacity:1}
.line-cover{width:34px;height:46px;display:inline-block}
@media (max-width:820px){.book-grid{grid-template-columns:repeat(auto-fill,minmax(130px,1fr))}.book-card .edit{opacity:1}}