:root{--orange:#ff6500;--black:#111214;--charcoal:#343940;--sidebar:#e9edf1;--selected:#d8dee5;--line:#d8dde3;--text:#151922;--muted:#65707d}
*{box-sizing:border-box}body{margin:0;font-family:Arial,Helvetica,sans-serif;background:#f6f7f9;color:var(--text)}
.top{height:88px;background:var(--black);border-bottom:7px solid var(--orange);display:flex;align-items:center;padding:0 28px;color:#fff}
.logo{font-size:30px;font-weight:700;letter-spacing:-1px}.logo .e{color:var(--orange);font-style:italic}.title{margin-left:26px;padding-left:26px;border-left:1px solid #777;font-size:25px;font-weight:700}
.top .spacer{flex:1}.top a{color:#fff;text-decoration:none;margin-left:22px}
.shell{display:flex;min-height:calc(100vh - 88px)}.side{width:260px;background:var(--sidebar);padding:34px 16px;border-right:1px solid #d7dce2}
.side h4{font-size:12px;color:#59636e;margin:0 12px 16px}.side a{display:block;padding:14px 18px;margin:3px 0;color:#252b33;text-decoration:none;border-radius:5px}
.side a.active{background:var(--selected);border-left:4px solid var(--orange);font-weight:700}.main{flex:1;padding:34px;max-width:1400px}
h1{margin:0 0 6px;font-size:30px}p.sub{margin-top:0;color:var(--muted)}
.card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:20px;margin:18px 0;box-shadow:0 1px 2px rgba(0,0,0,.03)}
.grid{display:grid;grid-template-columns:repeat(4,minmax(160px,1fr));gap:16px}.stat{font-size:30px;font-weight:700}.stat small{display:block;font-size:13px;color:var(--muted);font-weight:400;margin-top:5px}
table{width:100%;border-collapse:collapse;background:#fff}th,td{padding:13px;border-bottom:1px solid var(--line);text-align:left;font-size:14px}th{background:#f0f2f4}
.badge{padding:5px 9px;border-radius:999px;background:#edf0f3;font-size:12px}.btn{display:inline-block;border:0;border-radius:7px;background:var(--orange);color:white;padding:11px 17px;font-weight:700;text-decoration:none;cursor:pointer}
.btn.secondary{background:#fff;color:#222;border:1px solid #cbd1d7}.drop{border:2px dashed #bcc5cf;border-radius:10px;padding:38px;text-align:center;background:#fbfcfd}.drop.drag{border-color:var(--orange);background:#fff7f1}
input,select{padding:11px;border:1px solid #cbd1d7;border-radius:6px;max-width:100%}.login{max-width:440px;margin:80px auto}.error{background:#fff0f0;color:#8d1d1d;padding:12px;border-radius:6px}.ok{background:#edf9ef;color:#236b2e;padding:12px;border-radius:6px}
.progress{height:10px;background:#e3e7eb;border-radius:99px;overflow:hidden;margin-top:12px}.progress>div{height:100%;width:0;background:var(--orange)}

/* Tablet optimization: same product, adapted layout */
@media(max-width:1024px){
  .top{height:78px;padding:0 20px}
  .logo{font-size:25px}.title{font-size:20px;margin-left:18px;padding-left:18px}
  .shell{min-height:calc(100vh - 78px)}
  .side{width:205px;padding:24px 12px}
  .main{padding:24px}
  .grid{grid-template-columns:repeat(2,minmax(150px,1fr))}
  th,td{padding:12px 9px}
}

/* Phone optimization: navigation becomes a horizontal touch strip and tables become cards */
@media(max-width:680px){
  body{font-size:16px}
  .top{height:auto;min-height:72px;padding:14px 16px;border-bottom-width:5px;flex-wrap:wrap;gap:5px 0}
  .logo{font-size:23px}.title{font-size:16px;margin-left:12px;padding-left:12px}
  .top .spacer{flex-basis:100%;height:0}
  .top span{font-size:13px}.top a{font-size:13px;margin-left:auto}
  .shell{display:block;min-height:0}
  .side{width:100%;padding:8px;background:var(--sidebar);border-right:0;border-bottom:1px solid #d7dce2;
        display:flex;gap:6px;overflow-x:auto;-webkit-overflow-scrolling:touch;position:sticky;top:0;z-index:10}
  .side h4{display:none}
  .side a{flex:0 0 auto;padding:11px 14px;margin:0;white-space:nowrap;min-height:44px;display:flex;align-items:center}
  .side a.active{border-left:0;border-bottom:3px solid var(--orange)}
  .main{padding:18px 14px}
  h1{font-size:25px}
  .grid{grid-template-columns:1fr;gap:10px}
  .card{padding:16px;margin:13px 0;border-radius:8px}
  .drop{padding:25px 14px}
  .drop .btn,.btn{min-height:44px;padding:12px 16px}
  input,select{min-height:44px;font-size:16px}
  .login{margin:28px 14px}
  table,thead,tbody,tr,th,td{display:block;width:100%}
  tr{border-bottom:1px solid var(--line);padding:10px 0}
  th{display:none}
  td{border:0;padding:5px 0}
  td .btn{width:100%;text-align:center;margin-top:5px}
  .progress{height:13px}
}