:root {
  --navy: #1e3a5f; --navy-dark: #162c49; --red: #c0392b;
  --bg: #f2f4f7; --card: #ffffff; --line: #dde3ea; --muted: #6b7a8c;
  --green: #1e7e34;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
       background: var(--bg); color: #1c2733; }
header { background: var(--navy); color: #fff; padding: 14px 24px;
         display: flex; align-items: center; gap: 28px; flex-wrap: wrap; }
header h1 { font-size: 18px; margin: 0; letter-spacing: .3px; }
header nav a { color: #cdd9e8; text-decoration: none; font-size: 15px;
               padding: 6px 12px; border-radius: 6px; }
header nav a.active, header nav a:hover { background: var(--navy-dark); color: #fff; }
.user-box { margin-left: auto; display: flex; align-items: center; gap: 12px; font-size: 14px; color: #cdd9e8; }
.user-box a { color: #cdd9e8; text-decoration: none; border: 1px solid #3a5170; padding: 5px 12px; border-radius: 6px; }
main { max-width: 1100px; margin: 24px auto; padding: 0 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px;
        padding: 20px 24px; margin-bottom: 20px; }
h2 { margin: 0 0 14px; font-size: 17px; color: var(--navy); }
label { display: block; font-size: 13px; font-weight: 600; color: var(--muted); margin-bottom: 4px; }
input, select, textarea { font-size: 17px; padding: 9px 10px; border: 1px solid #b8c2cd;
        border-radius: 7px; width: 100%; background: #fff; }
input:focus, textarea:focus { outline: 2px solid var(--navy); border-color: var(--navy); }
.grid { display: grid; gap: 14px; }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 640px) { .grid.cols-3, .grid.cols-2 { grid-template-columns: 1fr; } }
.btn { display: inline-block; background: var(--navy); color: #fff; border: none;
       font-size: 16px; font-weight: 600; padding: 11px 22px; border-radius: 8px;
       cursor: pointer; text-decoration: none; }
.btn:hover { background: var(--navy-dark); }
.btn.secondary { background: #fff; color: var(--navy); border: 1.5px solid var(--navy); }
.btn.small { font-size: 13px; padding: 5px 12px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); white-space: nowrap; }
th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .4px; }
tr:hover td { background: #f7f9fb; }
.kr { font-family: ui-monospace, Menlo, monospace; font-weight: 700; color: var(--red); }
.pill { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.pill.instock { background: #e2f3e6; color: var(--green); }
.pill.empty { background: #f6e3e1; color: var(--red); }
.pill.low { background: #fdf1dc; color: #9a6700; }
.error { background: #fdecea; border: 1px solid #f5c6c0; color: #92281c;
         padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; }
.success { background: #e8f5ec; border: 1px solid #bfe3c8; color: #18602b;
           padding: 14px 18px; border-radius: 8px; margin-bottom: 20px; }
.muted { color: var(--muted); font-size: 13px; }
.filters { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; }
.filters > div { min-width: 110px; }
.stat { font-size: 22px; font-weight: 700; color: var(--navy); }
.modal-overlay { position: fixed; inset: 0; background: rgba(20,30,45,.55);
                 display: flex; align-items: center; justify-content: center;
                 padding: 16px; z-index: 100; }
.modal-overlay[hidden] { display: none; }
.modal { background: #fff; border-radius: 12px; width: 100%; max-width: 460px;
         padding: 22px 24px; box-shadow: 0 20px 60px rgba(0,0,0,.3); }
.modal h3 { margin: 0 0 4px; color: var(--navy); font-size: 19px; }
.info-grid { display: grid; grid-template-columns: auto 1fr; gap: 6px 16px;
             margin: 14px 0; font-size: 15px; }
.info-grid dt { color: var(--muted); font-weight: 600; }
.info-grid dd { margin: 0; font-weight: 600; }
.modal-actions { display: flex; gap: 10px; margin-top: 18px; flex-wrap: wrap; }
.bit-note { background: #eef2f7; border-radius: 8px; padding: 10px 12px;
            font-size: 14px; color: #33445a; margin-top: 10px; }