:root {
    --vb-primary:      #2563eb;
    --vb-primary-dark: #1d4ed8;
    --vb-danger:       #dc2626;
    --vb-success:      #16a34a;
    --vb-warning:      #d97706;
    --vb-gray-50:      #f9fafb;
    --vb-gray-100:     #f3f4f6;
    --vb-gray-200:     #e5e7eb;
    --vb-gray-500:     #6b7280;
    --vb-gray-700:     #374151;
    --vb-gray-900:     #111827;
    --vb-radius:       8px;
    --vb-shadow:       0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    color: var(--vb-gray-700);
    background: var(--vb-gray-50);
    line-height: 1.5;
}

/* ── Layout ── */
.layout { display: flex; min-height: 100vh; }

.sidebar {
    width: 220px;
    background: var(--vb-gray-900);
    color: #fff;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-brand {
    padding: 20px 16px 16px;
    border-bottom: 1px solid rgba(255,255,255,.1);
}

.sidebar-brand h1 { font-size: 16px; font-weight: 700; color: #fff; }
.sidebar-brand span { font-size: 11px; color: rgba(255,255,255,.5); }

.sidebar-nav { padding: 12px 0; flex: 1; }

.nav-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 9px 16px;
    color: rgba(255,255,255,.7);
    text-decoration: none;
    font-size: 13px;
    border-left: 3px solid transparent;
    transition: all .15s;
}

.nav-item:hover, .nav-item.active {
    background: rgba(255,255,255,.06);
    color: #fff;
    border-left-color: var(--vb-primary);
}

.nav-item svg { width: 16px; height: 16px; flex-shrink: 0; }

.sidebar-footer {
    padding: 12px 16px;
    border-top: 1px solid rgba(255,255,255,.1);
}

.sidebar-footer form { margin: 0; }

.btn-logout {
    width: 100%;
    background: none;
    border: 1px solid rgba(255,255,255,.2);
    color: rgba(255,255,255,.7);
    padding: 7px 12px;
    border-radius: var(--vb-radius);
    cursor: pointer;
    font-size: 12px;
    transition: all .15s;
}

.btn-logout:hover { background: rgba(255,255,255,.1); color: #fff; }

.main { flex: 1; display: flex; flex-direction: column; overflow: hidden; }

.topbar {
    background: #fff;
    border-bottom: 1px solid var(--vb-gray-200);
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.topbar h2 { font-size: 16px; font-weight: 600; color: var(--vb-gray-900); }
.topbar-meta { font-size: 12px; color: var(--vb-gray-500); }

.page { padding: 24px; flex: 1; }

/* ── Cards ── */
.card {
    background: #fff;
    border: 1px solid var(--vb-gray-200);
    border-radius: var(--vb-radius);
    box-shadow: var(--vb-shadow);
}

.card-body { padding: 20px; }
.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--vb-gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.card-header h3 { font-size: 14px; font-weight: 600; }

/* ── Stats ── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: #fff;
    border: 1px solid var(--vb-gray-200);
    border-radius: var(--vb-radius);
    padding: 16px 20px;
    box-shadow: var(--vb-shadow);
}

.stat-card .label { font-size: 11px; color: var(--vb-gray-500); text-transform: uppercase; letter-spacing: .05em; margin-bottom: 4px; }
.stat-card .value { font-size: 28px; font-weight: 700; color: var(--vb-gray-900); }
.stat-card .sub { font-size: 11px; color: var(--vb-gray-500); margin-top: 2px; }

.stat-card.success .value { color: var(--vb-success); }
.stat-card.warning .value { color: var(--vb-warning); }
.stat-card.danger  .value { color: var(--vb-danger); }

/* ── Tables ── */
.table-wrap { overflow-x: auto; }

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

thead th {
    padding: 10px 12px;
    text-align: left;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--vb-gray-500);
    border-bottom: 1px solid var(--vb-gray-200);
    background: var(--vb-gray-50);
}

tbody td {
    padding: 12px;
    border-bottom: 1px solid var(--vb-gray-100);
    color: var(--vb-gray-700);
}

tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--vb-gray-50); }

.mono { font-family: 'SF Mono', Monaco, Inconsolata, monospace; font-size: 12px; }

/* ── Badges ── */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 9999px;
    font-size: 11px;
    font-weight: 600;
}

.badge-active   { background: #dcfce7; color: #15803d; }
.badge-inactive { background: #f3f4f6; color: #6b7280; }
.badge-warning  { background: #fef9c3; color: #92400e; }

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: var(--vb-radius);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    text-decoration: none;
    transition: all .15s;
}

.btn-primary  { background: var(--vb-primary); color: #fff; }
.btn-primary:hover  { background: var(--vb-primary-dark); }

.btn-secondary { background: #fff; color: var(--vb-gray-700); border: 1px solid var(--vb-gray-200); }
.btn-secondary:hover { background: var(--vb-gray-50); }

.btn-danger { background: var(--vb-danger); color: #fff; }
.btn-danger:hover { background: #b91c1c; }

.btn-sm { padding: 5px 10px; font-size: 12px; }

/* ── Forms ── */
.form-group { margin-bottom: 16px; }

label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--vb-gray-700);
    margin-bottom: 6px;
}

input[type="text"],
input[type="password"],
input[type="date"],
input[type="number"],
select {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--vb-gray-200);
    border-radius: var(--vb-radius);
    font-size: 13px;
    color: var(--vb-gray-900);
    background: #fff;
    transition: border-color .15s;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--vb-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,.1);
}

.form-hint { font-size: 11px; color: var(--vb-gray-500); margin-top: 4px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ── Alerts ── */
.alert {
    padding: 12px 16px;
    border-radius: var(--vb-radius);
    font-size: 13px;
    margin-bottom: 16px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.alert-success { background: #f0fdf4; border: 1px solid #bbf7d0; color: #15803d; }
.alert-error   { background: #fef2f2; border: 1px solid #fecaca; color: #991b1b; }

/* ── Login page ── */
.login-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--vb-gray-50);
}

.login-card {
    background: #fff;
    border: 1px solid var(--vb-gray-200);
    border-radius: 12px;
    padding: 36px 32px;
    width: 100%;
    max-width: 380px;
    box-shadow: var(--vb-shadow);
}

.login-card .brand { text-align: center; margin-bottom: 28px; }
.login-card .brand h1 { font-size: 22px; font-weight: 700; color: var(--vb-gray-900); }
.login-card .brand p { font-size: 12px; color: var(--vb-gray-500); margin-top: 4px; }

/* ── Utils ── */
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.flex  { display: flex; }
.gap-8 { gap: 8px; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.text-sm { font-size: 12px; }
.text-gray { color: var(--vb-gray-500); }
.text-right { text-align: right; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.w-full { width: 100%; }