:root {
    --bg: #f4f5f7;
    --panel: #ffffff;
    --border: #e2e4e9;
    --text: #1c1f26;
    --muted: #6b7280;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --danger: #dc2626;
    --success: #16a34a;
    --warn: #d97706;
    --radius: 8px;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 14px;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.app-shell { display: flex; min-height: 100vh; }

.sidebar {
    width: 220px;
    flex-shrink: 0;
    background: #14161c;
    color: #d7d9e0;
    padding: 20px 0;
}

.sidebar .brand {
    font-weight: 700;
    font-size: 16px;
    color: #fff;
    padding: 0 20px 20px;
    border-bottom: 1px solid #2a2d36;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-toggle {
    display: none;
    background: none;
    border: 1px solid #3a3d46;
    color: #fff;
    border-radius: 6px;
    padding: 4px 10px;
    font-size: 16px;
    cursor: pointer;
}

.sidebar nav a {
    display: block;
    padding: 10px 20px;
    color: #b7bac4;
}

.sidebar nav a:hover, .sidebar nav a.active {
    background: #1f222b;
    color: #fff;
    text-decoration: none;
}

.main {
    flex: 1;
    padding: 24px 32px;
    max-width: 1200px;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.topbar h1 { margin: 0; font-size: 22px; }

.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 20px;
    overflow-x: auto;
}

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .03em; }
tr:last-child td { border-bottom: none; }
table.compact th, table.compact td { padding: 6px 8px; }

.btn {
    display: inline-block;
    padding: 8px 14px;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: #fff;
    color: var(--text);
    cursor: pointer;
    font-size: 13px;
    text-decoration: none;
}
.btn:hover { background: #f0f1f3; text-decoration: none; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-danger { background: #fff; border-color: var(--danger); color: var(--danger); }
.btn-danger:hover { background: #fef2f2; }
.btn-sm { padding: 4px 9px; font-size: 12px; }

form.inline { display: inline; }

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 20px; }
.form-grid.full, .field.full { grid-column: 1 / -1; }
.field { display: flex; flex-direction: column; gap: 4px; margin-bottom: 4px; }
.field label { font-size: 12px; color: var(--muted); font-weight: 600; }
input, select, textarea {
    padding: 8px 10px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    background: #fff;
    color: var(--text);
}
textarea { resize: vertical; min-height: 70px; }
.actions { margin-top: 16px; display: flex; gap: 10px; }

.badge {
    display: inline-block;
    padding: 2px 9px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .03em;
}
.badge-in_stock { background: #e0f2fe; color: #075985; }
.badge-deployed { background: #dcfce7; color: #166534; }
.badge-in_repair { background: #fef3c7; color: #92400e; }
.badge-retired { background: #e5e7eb; color: #374151; }
.badge-sold { background: #ede9fe; color: #5b21b6; }
.badge-unused { background: #e5e7eb; color: #374151; }
.badge-assigned { background: #dcfce7; color: #166534; }

.flash { padding: 10px 14px; border-radius: 6px; margin-bottom: 14px; font-size: 13px; }
.flash-success { background: #dcfce7; color: #166534; }
.flash-error { background: #fee2e2; color: #991b1b; }

.muted { color: var(--muted); }
.filters { display: flex; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; }
.filters input, .filters select { min-width: 160px; }

.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 20px; }
.stat-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; }
.stat-card .value { font-size: 26px; font-weight: 700; }
.stat-card .label { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .03em; }

.login-wrap { display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.login-box { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; width: 340px; }
.login-box h1 { text-align: center; font-size: 18px; margin-bottom: 20px; }
.login-box .field { margin-bottom: 14px; }

.label-preview {
    border: 2px dashed var(--border);
    border-radius: 6px;
    padding: 16px;
    display: inline-block;
    background: #fff;
}

.tabs { margin-bottom: 20px; }
.tab-nav {
    display: flex;
    gap: 4px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 16px;
}
.tab-btn {
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    padding: 10px 16px;
    font-size: 13px;
    font-weight: 600;
    color: var(--muted);
    cursor: pointer;
    border-radius: 0;
}
.tab-btn:hover { background: none; color: var(--text); }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); }

.searchable { position: relative; }
.searchable-list {
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    right: 0;
    max-height: 240px;
    overflow-y: auto;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 6px;
    box-shadow: 0 4px 14px rgba(0,0,0,.1);
    z-index: 20;
}
.searchable-item {
    padding: 10px 12px;
    font-size: 14px;
    cursor: pointer;
}
.searchable-item:hover { background: #f0f1f3; }

.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }

.checkbox-list { display: flex; flex-wrap: wrap; gap: 8px; }
.checkbox-list label {
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 6px 10px;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
}

/* ---- Responsive: Tablet ---- */
@media (max-width: 900px) {
    .form-grid { grid-template-columns: 1fr; }
    .stat-grid { grid-template-columns: repeat(2, 1fr); }
    .main { padding: 20px; }
}

/* ---- Responsive: Mobile / Tablet Nav ---- */
@media (max-width: 768px) {
    .app-shell { flex-direction: column; }

    .sidebar {
        width: 100%;
        padding: 12px 0;
    }
    .sidebar .brand { padding: 0 16px 12px; }
    .nav-toggle { display: block; }

    .sidebar nav {
        display: none;
        flex-direction: column;
        padding-top: 8px;
    }
    .sidebar nav.open { display: flex; }

    .main { padding: 16px; }

    .topbar {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    .topbar h1 { font-size: 19px; }

    .stat-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .stat-card { padding: 12px; }
    .stat-card .value { font-size: 21px; }

    .filters { flex-direction: column; align-items: stretch; }
    .filters input, .filters select { min-width: 0; width: 100%; }

    .actions { flex-wrap: wrap; }

    table { font-size: 13px; }
    th, td { padding: 8px 6px; }
}

@media (max-width: 480px) {
    .stat-grid { grid-template-columns: 1fr; }
}