/* ── Base ──────────────────────────────────────────────────────────────── */
html, body {
    font-family: 'Inter', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    font-size: 14px;
    color: #0f172a;
    background: #f8fafc;
}

a, .btn-link {
    color: #2563eb;
    text-decoration: none;
}

a:hover { text-decoration: underline; }

/* ── Sidebar ───────────────────────────────────────────────────────────── */
.sidebar {
    background: #1e293b !important;
}

.sidebar .navbar-brand {
    color: #f8fafc !important;
    font-weight: 600;
    font-size: 1rem;
    letter-spacing: 0.02em;
}

/* Nav links */
.sidebar .nav-link {
    color: #94a3b8 !important;
    border-radius: 6px;
    padding: 0.45rem 0.75rem;
    margin: 1px 0;
    font-size: 0.875rem;
    transition: background 0.15s, color 0.15s;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    color: #f8fafc !important;
    background: rgba(255, 255, 255, 0.08) !important;
}

/* Nav section label */
.nav-section-label {
    color: #475569;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 1rem 0.75rem 0.25rem;
}

/* User info at bottom */
.sidebar-user {
    color: #64748b;
    font-size: 0.8rem;
    padding: 0.5rem 0.75rem;
}

.sidebar-user strong {
    color: #cbd5e1;
}

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

.main {
    flex: 1;
    min-width: 0;
}

.top-row {
    background: #ffffff;
    border-bottom: 1px solid #e2e8f0;
    padding: 0.6rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.5rem;
    min-height: 50px;
}

.content {
    padding: 1.5rem;
}

/* ── Page Header ───────────────────────────────────────────────────────── */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 1rem;
    border-bottom: 1px solid #e2e8f0;
    margin-bottom: 1.5rem;
}

.page-header h1 {
    font-size: 1.4rem;
    font-weight: 600;
    margin: 0;
    color: #0f172a;
}

/* ── Cards ─────────────────────────────────────────────────────────────── */
.card {
    border: 1px solid #e2e8f0 !important;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.card-header {
    background: #f8fafc;
    border-bottom: 1px solid #e2e8f0;
    font-weight: 600;
    font-size: 0.875rem;
    color: #374151;
    padding: 0.75rem 1.25rem;
}

/* ── Tables ────────────────────────────────────────────────────────────── */
.table {
    font-size: 0.875rem;
    margin-bottom: 0;
}

.table thead th {
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: #6b7280;
    border-bottom: 2px solid #e2e8f0;
    padding: 0.6rem 0.75rem;
    background: #f9fafb;
}

.table td {
    vertical-align: middle;
    padding: 0.65rem 0.75rem;
    color: #374151;
    border-color: #f1f5f9;
}

.table-hover tbody tr:hover td {
    background: #f0f9ff;
}

.table-actions {
    white-space: nowrap;
    text-align: right;
    width: 1%;
}

/* ── Badges ────────────────────────────────────────────────────────────── */
.badge {
    font-size: 0.7rem;
    font-weight: 500;
    padding: 0.25em 0.55em;
    border-radius: 4px;
}

/* ── Buttons ───────────────────────────────────────────────────────────── */
.btn {
    font-size: 0.875rem;
    border-radius: 6px;
}

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

.btn-primary:hover {
    background-color: #1d4ed8;
    border-color: #1d4ed8;
}

.btn-sm {
    font-size: 0.75rem;
    padding: 0.25rem 0.6rem;
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus,
.form-control:focus, .form-check-input:focus {
    box-shadow: 0 0 0 0.15rem rgba(37, 99, 235, 0.25);
}

/* ── Forms ─────────────────────────────────────────────────────────────── */
.form-control, .form-select {
    font-size: 0.875rem;
    border-color: #d1d5db;
    border-radius: 6px;
}

.form-control:focus, .form-select:focus {
    border-color: #2563eb;
}

.form-label {
    font-size: 0.8rem;
    font-weight: 500;
    color: #374151;
    margin-bottom: 0.3rem;
}

/* ── Empty state ───────────────────────────────────────────────────────── */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: #9ca3af;
}

.empty-state p {
    margin: 0;
    font-size: 0.9rem;
}

/* ── Search / Filter bar ───────────────────────────────────────────────── */
.filter-bar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.filter-bar .form-control,
.filter-bar .form-select {
    max-width: 220px;
}

/* ── Assignments panel ─────────────────────────────────────────────────── */
.assignment-panel {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

@media (max-width: 768px) {
    .assignment-panel { grid-template-columns: 1fr; }
}

.assignment-list {
    max-height: 320px;
    overflow-y: auto;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    background: #fff;
}

.assignment-list-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.45rem 0.75rem;
    border-bottom: 1px solid #f1f5f9;
    font-size: 0.8rem;
}

.assignment-list-item:last-child { border-bottom: none; }

.assignment-list-item:hover { background: #f8fafc; }

/* ── Validation ────────────────────────────────────────────────────────── */
.valid.modified:not([type=checkbox]) { outline: 1px solid #16a34a; }
.invalid { outline: 1px solid #dc2626; }
.validation-message { color: #dc2626; font-size: 0.78rem; }

/* ── Error boundary ────────────────────────────────────────────────────── */
.blazor-error-boundary {
    background: url(data:image/svg+xml;base64,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) no-repeat 1rem/1.8rem, #b32121;
    padding: 1rem 1rem 1rem 3.7rem;
    color: white;
    border-radius: 6px;
}

.blazor-error-boundary::after { content: "An unhandled error has occurred." }