:root {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-secondary: #0f766e;
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #111827;
    --color-muted: #64748b;
    --color-border: #e5e7eb;
    --color-success: #16a34a;
    --color-warning: #d97706;
    --color-error: #dc2626;
    --color-info: #0284c7;
    --radius: 8px;
    --font-base: Inter, "Segoe UI", Roboto, Arial, sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-base);
    font-size: 15px;
}

.app-shell {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 248px 1fr;
}

.sidebar {
    background: #ffffff;
    border-right: 1px solid var(--color-border);
    padding: 24px 18px;
    display: flex;
    flex-direction: column;
}

.brand {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 28px;
}

.nav {
    display: grid;
    gap: 6px;
}

.nav a {
    color: var(--color-muted);
    text-decoration: none;
    padding: 10px 12px;
    border-radius: var(--radius);
}

.nav a:hover,
.nav a[aria-current="page"] {
    color: var(--color-primary);
    background: #eff6ff;
}

.sidebar-user {
    border-top: 1px solid var(--color-border);
    color: var(--color-muted);
    display: grid;
    gap: 10px;
    margin-top: auto;
    padding-top: 18px;
}

.main {
    padding: 28px;
}

.page-header {
    margin-bottom: 24px;
}

.page-header.split {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.page-title {
    margin: 0;
    font-size: 24px;
    line-height: 1.2;
}

.page-subtitle {
    margin: 8px 0 0;
    color: var(--color-muted);
}

.metric-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(160px, 1fr));
    gap: 16px;
}

.metric {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 18px;
}

.metric-label {
    margin: 0;
    color: var(--color-muted);
    font-size: 13px;
}

.metric-value {
    margin: 8px 0 0;
    font-size: 24px;
    font-weight: 700;
}

.metric-value.compact {
    font-size: 18px;
    line-height: 1.3;
}

.panel {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    margin-top: 20px;
    padding: 18px;
}

.login-page {
    align-items: center;
    background: var(--color-bg);
    display: grid;
    min-height: 100vh;
    padding: 24px;
    place-items: center;
}

.login-panel {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    max-width: 420px;
    padding: 28px;
    width: 100%;
}

.login-panel h1 {
    font-size: 24px;
    margin: 0 0 8px;
}

.login-panel p {
    color: var(--color-muted);
    margin: 0 0 22px;
}

.panel h2 {
    margin: 0 0 16px;
    font-size: 17px;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 38px;
    border: 1px solid transparent;
    border-radius: var(--radius);
    padding: 8px 14px;
    font: inherit;
    text-decoration: none;
    cursor: pointer;
}

.button.primary {
    background: var(--color-primary);
    color: #ffffff;
}

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

.button.secondary {
    background: #ffffff;
    color: var(--color-text);
    border-color: var(--color-border);
}

.button.ghost {
    background: transparent;
    color: var(--color-primary);
}

.button.danger {
    background: #fef2f2;
    color: var(--color-error);
    border-color: #fecaca;
}

.alert {
    border-radius: var(--radius);
    margin: 16px 0;
    padding: 12px 14px;
}

.alert.success {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    color: #166534;
}

.alert.warning {
    background: #fffbeb;
    border: 1px solid #fed7aa;
    color: #92400e;
}

.filter-grid,
.form-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(160px, 1fr));
    gap: 14px;
    align-items: end;
}

.form-grid {
    grid-template-columns: repeat(2, minmax(220px, 1fr));
    align-items: start;
}

.stack {
    display: grid;
    gap: 2px;
    max-width: 980px;
}

.tabbed-form {
    display: grid;
    gap: 0;
    max-width: 1100px;
}

.tab-content {
    min-width: 0;
}

.tab-panel {
    display: none;
    margin-top: 0;
}

.tab-panel.is-active {
    display: block;
}

.tabs-top {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-bottom: 0;
    border-radius: var(--radius) var(--radius) 0 0;
    display: flex;
    gap: 0;
    overflow-x: auto;
    padding: 0 10px;
}

.tab-button {
    background: transparent;
    border: 0;
    border-bottom: 3px solid transparent;
    border-radius: 0;
    color: var(--color-muted);
    cursor: pointer;
    font: inherit;
    font-weight: 600;
    min-height: 48px;
    padding: 12px 18px;
    white-space: nowrap;
}

.tab-button:hover,
.tab-button.is-active {
    background: #eff6ff;
    border-bottom-color: var(--color-primary);
    color: var(--color-primary);
}

.tabbed-form .panel {
    border-radius: 0 0 var(--radius) var(--radius);
    margin-top: 0;
}

label {
    display: grid;
    gap: 6px;
    color: var(--color-muted);
    font-size: 13px;
}

input,
select,
textarea {
    width: 100%;
    min-height: 38px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: #ffffff;
    color: var(--color-text);
    font: inherit;
    padding: 8px 10px;
}

.select-with-action {
    align-items: center;
    display: grid;
    gap: 8px;
    grid-template-columns: minmax(0, 1fr) 42px;
}

.catalog-button {
    min-height: 38px;
    padding: 0;
    width: 42px;
}

textarea {
    resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
    outline: none;
}

.wide {
    grid-column: 1 / -1;
}

.form-actions {
    display: flex;
    grid-column: 1 / -1;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 18px;
}

.attachment-list {
    display: grid;
    gap: 10px;
    margin-top: 16px;
}

.attachment-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    gap: 4px;
    justify-content: space-between;
    padding: 10px 12px;
}

.attachment-item span {
    color: var(--color-muted);
    display: block;
    font-size: 13px;
}

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

.data-table th,
.data-table td {
    border-bottom: 1px solid var(--color-border);
    padding: 11px 10px;
    text-align: left;
    vertical-align: middle;
}

.data-table th {
    color: var(--color-muted);
    font-size: 13px;
    font-weight: 600;
}

.actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

.actions form {
    margin: 0;
}

.chart-panel {
    display: grid;
    gap: 16px;
}

.chart-header {
    align-items: start;
    display: grid;
    gap: 14px;
}

.chart-header h2 {
    margin-bottom: 0;
}

.chart-filters {
    align-items: end;
    display: grid;
    gap: 12px;
    grid-template-columns: minmax(130px, 150px) minmax(145px, 170px) minmax(145px, 170px) minmax(145px, 170px) minmax(145px, 170px) auto auto;
}

.inline-form {
    align-items: center;
    display: flex;
    gap: 8px;
}

.compact-input {
    min-height: 38px;
    width: 150px;
}

.modal-backdrop {
    align-items: center;
    background: rgba(15, 23, 42, 0.42);
    display: flex;
    inset: 0;
    justify-content: center;
    padding: 24px;
    position: fixed;
    z-index: 50;
}

.modal-backdrop[hidden] {
    display: none;
}

.modal-panel {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: 0 24px 80px rgba(15, 23, 42, 0.22);
    max-height: calc(100vh - 48px);
    max-width: 1180px;
    overflow: auto;
    padding: 18px;
    width: 100%;
}

.modal-header,
.modal-actions {
    align-items: center;
    display: flex;
    gap: 12px;
    justify-content: space-between;
}

.modal-header h2 {
    margin: 0;
}

.modal-body {
    display: grid;
    gap: 14px;
    margin-top: 16px;
}

.maintenance-grid {
    display: grid;
    gap: 10px;
}

.maintenance-row {
    align-items: end;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    display: grid;
    gap: 10px;
    grid-template-columns: minmax(110px, 0.8fr) minmax(170px, 1.2fr) minmax(220px, 1.6fr) 90px 120px auto auto;
    padding: 12px;
}

.chart-wrap {
    min-height: 320px;
    position: relative;
}

.chart-wrap canvas {
    display: block;
    height: 320px;
    width: 100%;
}

.chart-wrap.square {
    min-height: 300px;
}

.chart-wrap.square canvas {
    height: 300px;
}

.chart-grid {
    align-items: start;
    display: grid;
    gap: 18px;
    grid-template-columns: minmax(280px, 420px) minmax(0, 1fr);
}

.compact-table {
    font-size: 14px;
}

@media (max-width: 860px) {
    .app-shell {
        grid-template-columns: 1fr;
    }

    .sidebar {
        border-right: 0;
        border-bottom: 1px solid var(--color-border);
    }

    .metric-grid {
        grid-template-columns: 1fr;
    }

    .page-header.split,
    .actions {
        align-items: stretch;
        flex-direction: column;
    }

    .filter-grid,
    .form-grid,
    .tabbed-form,
    .chart-filters,
    .chart-grid,
    .maintenance-row {
        grid-template-columns: 1fr;
    }

    .tabs-top {
        padding: 0 4px;
    }

    .tab-button {
        padding: 10px 12px;
    }
}