:root {
    --bg-primary: #0f1117;
    --bg-secondary: #1a1d27;
    --bg-card: #1e2130;
    --bg-input: #252838;
    --border: #2d3148;
    --border-focus: #6366f1;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --radius: 10px;
    --shadow: 0 4px 24px rgba(0,0,0,.35);
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    min-height: 100vh;
}

/* ── Sidebar ─────────────────────────────────────────────────── */
.sidebar {
    width: 240px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 100;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 17px;
    font-weight: 700;
    color: var(--accent);
    margin-bottom: 28px;
    padding: 0 8px;
}

.brand-icon { width: 26px; height: 26px; }

.nav-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all .15s;
}
.nav-link svg { width: 18px; height: 18px; flex-shrink: 0; }
.nav-link:hover { background: var(--bg-card); color: var(--text-primary); }
.nav-link.active { background: var(--accent); color: #fff; }

/* ── Content ─────────────────────────────────────────────────── */
.content {
    margin-left: 240px;
    flex: 1;
    min-height: 100vh;
}

.content-header {
    padding: 28px 36px 0;
}
.content-header h1 {
    font-size: 22px;
    font-weight: 700;
}

.content-body {
    padding: 24px 36px 40px;
}

/* ── Cards ───────────────────────────────────────────────────── */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 28px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 24px;
    box-shadow: var(--shadow);
}
.stat-card .stat-label {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--text-muted);
    margin-bottom: 6px;
}
.stat-card .stat-value {
    font-size: 28px;
    font-weight: 700;
}
.stat-card .stat-value.accent { color: var(--accent); }
.stat-card .stat-value.success { color: var(--success); }
.stat-card .stat-value.warning { color: var(--warning); }
.stat-card .stat-value.danger { color: var(--danger); }

/* ── Forms ───────────────────────────────────────────────────── */
.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
}
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group.full { grid-column: 1 / -1; }
.form-group label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

input[type="text"], input[type="email"], input[type="number"], input[type="date"], select {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 14px;
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    transition: border-color .15s;
}
input:focus, select:focus { border-color: var(--border-focus); }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 22px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all .15s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { opacity: .85; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: var(--danger-hover); }
.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
}
.btn-outline:hover { border-color: var(--text-primary); color: var(--text-primary); }
.btn-sm { padding: 6px 14px; font-size: 12px; }

.btn-row {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

/* ── Table ───────────────────────────────────────────────────── */
.table-wrapper {
    overflow-x: auto;
    margin-top: 16px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
thead th {
    text-align: left;
    padding: 10px 14px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}
tbody td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--border);
    vertical-align: middle;
}
tbody tr:hover { background: rgba(99,102,241,.06); }

.key-cell {
    font-family: 'Cascadia Code', 'Fira Code', monospace;
    font-size: 12px;
    letter-spacing: .04em;
}

/* ── Badges ──────────────────────────────────────────────────── */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 50px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
}
.badge-active { background: rgba(34,197,94,.15); color: var(--success); }
.badge-inactive { background: rgba(239,68,68,.15); color: var(--danger); }
.badge-expired { background: rgba(245,158,11,.15); color: var(--warning); }
.badge-pending { background: rgba(99,102,241,.15); color: var(--accent); }
.badge-batch {
    background: rgba(99,102,241,.1);
    color: var(--accent-hover);
    font-size: 10px;
    font-weight: 600;
    letter-spacing: .03em;
}

/* ── Result box ──────────────────────────────────────────────── */
.result-box {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px 20px;
    margin-top: 20px;
    display: none;
}
.result-box.visible { display: block; }
.result-box h3 {
    font-size: 14px;
    margin-bottom: 12px;
    color: var(--success);
}
.result-keys {
    font-family: 'Cascadia Code', 'Fira Code', monospace;
    font-size: 13px;
    line-height: 2;
    word-break: break-all;
    user-select: all;
}

/* ── Toast ───────────────────────────────────────────────────── */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 22px;
    font-size: 13px;
    font-weight: 600;
    box-shadow: var(--shadow);
    z-index: 9999;
    transition: opacity .3s, transform .3s;
}
.toast.hidden { opacity: 0; transform: translateY(10px); pointer-events: none; }
.toast.success { border-color: var(--success); color: var(--success); }
.toast.error { border-color: var(--danger); color: var(--danger); }

/* ── Filter bar ──────────────────────────────────────────────── */
.filter-bar {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}
.filter-bar input, .filter-bar select {
    max-width: 220px;
}
.filter-bar input[type="date"] {
    max-width: 170px;
    color-scheme: dark;
}

/* ── Misc ────────────────────────────────────────────────────── */
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.mb-4 { margin-bottom: 16px; }
.text-muted { color: var(--text-muted); }
.text-sm { font-size: 12px; }

.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-muted);
}
.empty-state svg { width: 48px; height: 48px; margin-bottom: 12px; opacity: .5; }

/* ── Pagination ─────────────────────────────────────────────── */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}
.page-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 10px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    text-decoration: none;
    background: transparent;
    border: 1px solid var(--border);
    transition: all .15s;
}
.page-link:hover { border-color: var(--accent); color: var(--accent); }
.page-link.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}
.page-dots {
    color: var(--text-muted);
    font-size: 14px;
    padding: 0 4px;
}

/* ── Collapsible group rows ────────────────────────────────── */
.group-header {
    cursor: pointer;
    background: rgba(99,102,241,.05);
    transition: background .15s;
}
.group-header:hover {
    background: rgba(99,102,241,.12) !important;
}
.group-header td {
    border-bottom: 1px solid rgba(99,102,241,.25);
    padding-top: 10px;
    padding-bottom: 10px;
}
.group-header.expanded {
    background: rgba(99,102,241,.10);
}
.group-toggle-cell {
    text-align: center;
    width: 36px;
    padding: 0 !important;
}
.group-toggle {
    display: inline-block;
    font-size: 11px;
    color: var(--accent);
    transition: transform .15s;
    width: 18px;
    text-align: center;
}
.group-stats {
    white-space: nowrap;
}
.group-stats .badge {
    font-size: 11px;
    padding: 3px 10px;
}
.group-child-row {
    background: rgba(99,102,241,.02);
}
.group-child-row td {
    padding-top: 8px;
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(45,49,72,.5);
}

.hidden { display: none !important; }

@media (max-width: 768px) {
    .sidebar { width: 60px; padding: 16px 8px; }
    .sidebar-brand span, .nav-link span { display: none; }
    .content { margin-left: 60px; }
    .content-body { padding: 16px; }
    .form-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
}