:root {
    --bg: #f5f7fb;
    --panel: #ffffff;
    --text: #172033;
    --muted: #667085;
    --line: #e5e7eb;
    --gold: #b98725;
    --gold-dark: #8a641d;
    --green: #0f8f61;
    --red: #c24135;
    --blue: #2563eb;
    --sidebar: #151922;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: Tahoma, Arial, sans-serif;
}
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
.app-shell { min-height: 100vh; display: grid; grid-template-columns: 260px 1fr; }
.sidebar { background: var(--sidebar); color: #d0d5dd; padding: 18px 14px; position: sticky; top: 0; height: 100vh; overflow-y: auto; }
.brand { display: flex; gap: 10px; align-items: center; padding: 10px 8px 22px; color: #fff; font-weight: 700; }
.brand-mark { width: 34px; height: 34px; border-radius: 8px; background: var(--gold); display: grid; place-items: center; color: #fff; }
.nav-title { margin: 18px 10px 8px; color: #8992a3; font-size: 12px; }
.nav-link { display: block; padding: 11px 12px; border-radius: 8px; color: #d0d5dd; margin-bottom: 4px; }
.nav-link:hover, .nav-link.active { background: #252b37; color: #fff; }
.main { min-width: 0; }
.topbar { height: 68px; background: var(--panel); border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; padding: 0 26px; position: sticky; top: 0; z-index: 10; }
.topbar h1 { margin: 0; font-size: 21px; }
.user-box { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 13px; }
.content { padding: 24px; }
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 18px; box-shadow: 0 1px 2px rgba(16, 24, 40, .04); }
.panel h2, .panel h3 { margin-top: 0; }
.stat { display: flex; flex-direction: column; gap: 8px; }
.stat span { color: var(--muted); font-size: 13px; }
.stat strong { font-size: 24px; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; min-width: 760px; }
th, td { padding: 12px 10px; border-bottom: 1px solid var(--line); text-align: right; vertical-align: middle; }
th { color: var(--muted); font-size: 13px; font-weight: 700; background: #fbfcfe; }
.form-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; align-items: end; }
.field label { display: block; color: var(--muted); font-size: 12px; margin-bottom: 6px; }
.field input, .field select, .field textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 10px 11px;
    background: #fff;
    color: var(--text);
}
.field textarea { min-height: 84px; resize: vertical; }
.btn {
    border: 0;
    border-radius: 8px;
    padding: 10px 14px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-height: 40px;
}
.btn-primary { background: var(--gold); color: #fff; }
.btn-primary:hover { background: var(--gold-dark); }
.btn-muted { background: #eef2f6; color: var(--text); }
.btn-danger { background: var(--red); color: #fff; }
.btn-small { padding: 7px 10px; min-height: auto; font-size: 12px; }
.badge { display: inline-flex; padding: 4px 8px; border-radius: 999px; font-size: 12px; font-weight: 700; background: #eef2f6; color: var(--muted); }
.badge.green { background: #e8f7ef; color: var(--green); }
.badge.red { background: #fdebea; color: var(--red); }
.badge.gold { background: #fff4d8; color: var(--gold-dark); }
.badge.blue { background: #e8efff; color: var(--blue); }
.flash { margin-bottom: 14px; padding: 12px 14px; border-radius: 8px; border: 1px solid var(--line); background: #fff; }
.flash.success { border-color: #b7ebc8; background: #eefbf3; color: #087443; }
.flash.error { border-color: #fac5bd; background: #fff1f0; color: #b42318; }
.login-page { min-height: 100vh; display: grid; place-items: center; padding: 24px; background: linear-gradient(135deg, #f7f2e8, #eef4f9); }
.login-card { width: min(420px, 100%); background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 28px; box-shadow: 0 18px 50px rgba(16, 24, 40, .12); }
.login-card h1 { margin-top: 0; }
.items-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 12px; }
.item-card { border: 1px solid var(--line); border-radius: 8px; padding: 12px; background: #fff; cursor: pointer; }
.item-card input { margin-left: 6px; }
.item-card strong { display: block; margin-bottom: 8px; }
.text-muted { color: var(--muted); }
.actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.ltr { direction: ltr; text-align: left; }

@media (max-width: 980px) {
    .app-shell { grid-template-columns: 1fr; }
    .sidebar { position: static; height: auto; }
    .grid-2, .grid-3, .grid-4, .form-grid { grid-template-columns: 1fr; }
    .content { padding: 16px; }
    .topbar { padding: 0 16px; }
}