:root {
    --color-bg: #f3f4f6;
    --color-surface: #ffffff;
    --color-border: #e5e7eb;
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-danger: #dc2626;
    --color-success: #16a34a;
    --color-warning: #f59e0b;
    --color-text: #1f2937;
    --radius-md: 12px;
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.08);
    --shadow-md: 0 10px 25px rgba(15, 23, 42, 0.08);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: var(--color-surface);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 50;
}

.brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.brand-logo {
    height: 48px;
    width: auto;
    flex-shrink: 0;
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.brand-title {
    font-size: 1.25rem;
    font-weight: 700;
}

.brand-subtitle {
    font-size: 0.85rem;
    color: #6b7280;
}

.main-nav {
    display: flex;
    gap: 1rem;
}

.nav-link {
    text-decoration: none;
    color: #4b5563;
    font-weight: 500;
    padding: 0.5rem 0.5rem;
    border-radius: 0.75rem;
    transition: background 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
    background: rgba(37, 99, 235, 0.1);
    color: var(--color-primary);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logout-link {
    text-decoration: none;
    color: var(--color-danger);
    font-weight: 600;
}

.app-content {
    padding: 2rem;
    width: min(95vw, 1400px);
    margin: 0 auto;
}

.flash-container {
    margin-bottom: 1.5rem;
}

.alert {
    padding: 0.85rem 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 0.75rem;
}

.alert-success { background: rgba(22, 163, 74, 0.15); color: var(--color-success); }
.alert-danger { background: rgba(220, 38, 38, 0.12); color: var(--color-danger); }
.alert-warning { background: rgba(245, 158, 11, 0.12); color: var(--color-warning); }
.alert-info { background: rgba(59, 130, 246, 0.12); color: var(--color-primary); }

.page-title {
    margin: 0;
    font-size: 1.75rem;
}

.page-subtitle {
    margin-top: 0.35rem;
    color: #6b7280;
}

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

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.card {
    background: var(--color-surface);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    margin-bottom: 1.5rem;
}

.card-number {
    font-size: 2.5rem;
    font-weight: 700;
}

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

.data-table th,
.data-table td {
    padding: 0.75rem 0.65rem;
    border-bottom: 1px solid var(--color-border);
    text-align: left;
}

.data-table tbody tr:hover {
    background: rgba(15, 23, 42, 0.03);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.65rem 1.1rem;
    border-radius: 0.75rem;
    border: none;
    background: #d1d5db;
    color: #1f2937;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.2s ease;
}

.btn.small {
    padding: 0.4rem 0.85rem;
    font-size: 0.85rem;
}

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

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

.btn.secondary {
    background: rgba(37, 99, 235, 0.12);
    color: var(--color-primary);
}

.btn.secondary:hover {
    background: rgba(37, 99, 235, 0.22);
}

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

.btn.danger:hover {
    background: #b91c1c;
}

.form-grid {
    display: grid;
    gap: 0.75rem;
}

.edit-grid {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.form-grid label {
    font-weight: 600;
}

.form-field {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.form-help {
    font-size: 0.85rem;
    color: #6b7280;
    margin-top: -0.2rem;
}

.form-grid input,
.form-grid select,
.form-grid textarea {
    padding: 0.6rem 0.75rem;
    border-radius: 0.65rem;
    border: 1px solid var(--color-border);
    font: inherit;
}

.table-wrapper {
    width: 100%;
    overflow-x: auto;
}

.inline-form {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.actions-cell {
    min-width: 320px;
    vertical-align: top;
}

.edit-row td {
    padding: 0;
    border-bottom: none;
}

.edit-form {
    margin-top: 0.75rem;
    padding: 1rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    background: rgba(37, 99, 235, 0.06);
}

.edit-row .edit-form {
    margin-top: 0;
}

.edit-form textarea {
    min-height: 80px;
    resize: vertical;
}

.form-checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-checkbox input[type="checkbox"] {
    width: auto;
    margin: 0;
}

.edit-grid .full-width {
    grid-column: 1 / -1;
}

.form-actions.full-width {
    grid-column: 1 / -1;
}

.actions-column {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: flex-start;
}

.action-form,
.action-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.action-form {
    width: auto;
}

.action-link {
    width: auto;
    justify-content: center;
}

.action-form input[type="number"] {
    flex: 1 1 120px;
    min-width: 0;
}

.actions-column .inline-form {
    flex-wrap: wrap;
}

.actions-column input[type="number"] {
    width: 100%;
    max-width: none;
}

.inline-form input[type="password"],
.inline-form input[type="text"] {
    max-width: 190px;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.form-inline {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    flex-wrap: wrap;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.6rem;
    border-radius: 999px;
    font-size: 0.85rem;
    font-weight: 600;
}

.status-success { background: rgba(22, 163, 74, 0.15); color: var(--color-success); }
.status-failed { background: rgba(220, 38, 38, 0.12); color: var(--color-danger); }

.warning-box {
    background: rgba(245, 158, 11, 0.12);
    border-left: 4px solid var(--color-warning);
    padding: 1rem;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
}

.modal {
    position: fixed;
    inset: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(15, 23, 42, 0.55);
    transition: opacity 0.2s ease;
}

.modal[hidden] {
    display: none;
}

.modal-content {
    background: var(--color-surface);
    padding: 1.75rem;
    border-radius: var(--radius-md);
    max-width: 420px;
    width: 100%;
    box-shadow: var(--shadow-md);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    margin-top: 1.25rem;
}

.selected-probe {
    font-weight: 600;
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }

.auth-card {
    max-width: 400px;
    margin: 4rem auto;
    background: var(--color-surface);
    padding: 2rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.app-footer {
    text-align: center;
    padding: 1.5rem 0;
    color: #9ca3af;
}

[hidden] {
    display: none !important;
}

.muted {
    color: #6b7280;
    font-size: 0.9rem;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.text-danger {
    color: var(--color-danger);
}

.text-success {
    color: var(--color-success);
}

.text-info {
    color: var(--color-primary);
}

@media (max-width: 768px) {
    .app-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .brand {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    .brand-logo {
        height: 40px;
    }

    .main-nav {
        flex-wrap: wrap;
    }

    .form-inline {
        flex-direction: column;
        align-items: stretch;
    }
}