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

body {
    font-family: system-ui, -apple-system, sans-serif;
    font-size: 14px;
    color: #1a1a1a;
    background: #f5f5f5;
}

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

.sidebar {
    width: 220px;
    background: #1e293b;
    color: #cbd5e1;
    flex-shrink: 0;
    padding: 0;
}

.sidebar-header {
    padding: 1rem 1.25rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: #f1f5f9;
    border-bottom: 1px solid #334155;
}

.sidebar-title { letter-spacing: 0.02em; }

.nav-list {
    list-style: none;
    padding: 0.5rem 0;
}

.nav-list li { padding: 0; }

.nav-section {
    padding: 1rem 1.25rem 0.25rem;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #64748b;
}

.nav-link {
    display: block;
    padding: 0.5rem 1.25rem;
    color: #94a3b8;
    text-decoration: none;
    border-left: 3px solid transparent;
    transition: background 0.1s, color 0.1s;
}

.nav-link:hover {
    background: #334155;
    color: #f1f5f9;
}

.nav-link.active {
    background: #334155;
    color: #f1f5f9;
    border-left-color: #3b82f6;
}

.content {
    flex: 1;
    overflow: auto;
}

.content article {
    padding: 2rem;
    max-width: 1100px;
}

/* Page header */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
}

.page-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1e293b;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 1rem;
    border-radius: 6px;
    border: 1px solid transparent;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.1s;
}

.btn-primary {
    background: #3b82f6;
    color: #fff;
    border-color: #3b82f6;
}

.btn-primary:hover { background: #2563eb; border-color: #2563eb; }

.btn-secondary {
    background: #fff;
    color: #374151;
    border-color: #d1d5db;
}

.btn-secondary:hover { background: #f9fafb; }

.btn-danger {
    background: #fff;
    color: #dc2626;
    border-color: #fca5a5;
}

.btn-danger:hover { background: #fef2f2; }

.btn-sm {
    padding: 0.25rem 0.6rem;
    font-size: 0.8rem;
}

/* Card */
.card {
    background: #fff;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
    overflow: hidden;
}

/* Table */
.table-container { overflow-x: auto; }

table {
    width: 100%;
    border-collapse: collapse;
}

th {
    text-align: left;
    padding: 0.75rem 1rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #64748b;
    border-bottom: 1px solid #e2e8f0;
    background: #f8fafc;
}

td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid #f1f5f9;
    color: #374151;
}

tr:last-child td { border-bottom: none; }
tr:hover td { background: #f8fafc; }

.table-actions { display: flex; gap: 0.5rem; }

/* Toolbar */
.toolbar {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid #e2e8f0;
    background: #f8fafc;
}

/* Search */
.search-input {
    flex: 1;
    padding: 0.4rem 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 0.875rem;
    outline: none;
}

.search-input:focus { border-color: #3b82f6; box-shadow: 0 0 0 2px #dbeafe; }

/* Form */
.form-card {
    background: #fff;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
    padding: 1.5rem;
    max-width: 600px;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: #374151;
    margin-bottom: 0.35rem;
}

.form-control {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 0.875rem;
    color: #1a1a1a;
    outline: none;
    background: #fff;
}

.form-control:focus { border-color: #3b82f6; box-shadow: 0 0 0 2px #dbeafe; }

.form-control.invalid { border-color: #dc2626; }

.validation-message {
    color: #dc2626;
    font-size: 0.8rem;
    margin-top: 0.25rem;
}

.form-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

/* Alert */
.alert {
    padding: 0.75rem 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.alert-danger { background: #fef2f2; color: #dc2626; border: 1px solid #fca5a5; }
.alert-success { background: #f0fdf4; color: #16a34a; border: 1px solid #86efac; }

/* Badge */
.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    font-size: 0.7rem;
    font-weight: 500;
    background: #e2e8f0;
    color: #475569;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 3rem;
    color: #94a3b8;
}

/* Loading */
.loading {
    padding: 2rem;
    text-align: center;
    color: #94a3b8;
}

/* Expired rows */
.row-expired td { color: #94a3b8; }
.row-expired:hover td { background: #f8fafc; }
.badge-expired { background: #fef2f2; color: #dc2626; }

/* Indent for hierarchy */
.indent-1 { padding-left: 1.5rem; }
.indent-2 { padding-left: 3rem; }

/* Confirm overlay */
.confirm-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.confirm-box {
    background: #fff;
    border-radius: 8px;
    padding: 1.5rem;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.confirm-box h3 { margin-bottom: 0.5rem; font-size: 1rem; }
.confirm-box p { color: #64748b; margin-bottom: 1.25rem; font-size: 0.875rem; }
.confirm-box .form-actions { margin-top: 0; }