:root {
    --bg: #f5f7fb;
    --panel: #ffffff;
    --border: #d9e0ea;
    --text: #1f2937;
    --muted: #6b7280;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --danger: #dc2626;
    --success: #15803d;
    --warning: #b45309;
    --sidebar: #111827;
}

* {
    box-sizing: border-box;
}

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

a {
    color: inherit;
    text-decoration: none;
}

button,
input,
select {
    font: inherit;
}

.app-shell {
    display: grid;
    grid-template-columns: 260px minmax(0, 1fr);
    min-height: 100vh;
}

.sidebar {
    background: var(--sidebar);
    color: #d1d5db;
    padding: 24px 18px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #ffffff;
    font-weight: 700;
}

.brand-mark {
    display: inline-grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border-radius: 8px;
    background: var(--primary);
}

.nav-list {
    display: grid;
    gap: 6px;
    margin-top: 30px;
}

.nav-list a {
    border-radius: 8px;
    padding: 10px 12px;
}

.nav-list a.active,
.nav-list a:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
}

.nav-list a.disabled {
    color: #6b7280;
    cursor: not-allowed;
}

.main-panel {
    min-width: 0;
    padding: 28px;
}

.topbar,
.panel-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.topbar {
    margin-bottom: 24px;
}

.topbar h1,
.auth-card h1 {
    margin: 0;
    font-size: 28px;
}

.eyebrow,
.muted {
    margin: 0 0 6px;
    color: var(--muted);
    font-size: 14px;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-chip {
    border: 1px solid var(--border);
    border-radius: 999px;
    background: #ffffff;
    padding: 8px 12px;
}

.button {
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #ffffff;
    color: var(--text);
    cursor: pointer;
    padding: 9px 14px;
    font-weight: 600;
}

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

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

.button.ghost {
    background: transparent;
}

.button.full {
    width: 100%;
}

.metric-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

.metric-card,
.panel,
.auth-card,
.alert {
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--panel);
}

.metric-card {
    display: grid;
    gap: 12px;
    padding: 18px;
}

.metric-card span {
    color: var(--muted);
}

.metric-card strong {
    font-size: 30px;
}

.metric-card.primary {
    border-top: 4px solid var(--primary);
}

.metric-card.info {
    border-top: 4px solid #0891b2;
}

.metric-card.warning {
    border-top: 4px solid var(--warning);
}

.metric-card.danger {
    border-top: 4px solid var(--danger);
}

.panel-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.panel {
    padding: 18px;
}

.panel h2 {
    margin: 0;
    font-size: 18px;
}

.empty-state {
    border: 1px dashed var(--border);
    border-radius: 8px;
    color: var(--muted);
    padding: 24px;
}

.alert {
    margin-bottom: 16px;
    padding: 12px 14px;
}

.alert.success {
    border-color: #86efac;
    background: #f0fdf4;
    color: var(--success);
}

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

.table-wrap {
    margin-top: 16px;
    overflow-x: auto;
}

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

th,
td {
    border-bottom: 1px solid var(--border);
    padding: 12px;
    text-align: left;
    vertical-align: top;
}

th {
    color: var(--muted);
    font-size: 13px;
    text-transform: uppercase;
}

input,
select,
textarea {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 12px;
}

textarea {
    resize: vertical;
}

fieldset {
    border: 1px solid var(--border);
    border-radius: 8px;
    margin: 0;
    padding: 12px;
}

legend {
    color: var(--muted);
    font-weight: 700;
    padding: 0 6px;
}

.tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 18px;
}

.tabs a {
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #ffffff;
    padding: 9px 12px;
}

.tabs a.active,
.tabs a:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.split-grid {
    display: grid;
    grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
    gap: 16px;
    align-items: start;
}

.builder-grid {
    display: grid;
    grid-template-columns: minmax(280px, 360px) minmax(0, 1.2fr) minmax(280px, 0.8fr);
    gap: 16px;
    align-items: start;
}

.field-editor {
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-top: 14px;
    padding: 14px;
}

.field-editor.compact {
    background: #f9fafb;
}

.field-editor-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
}

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

.field-list {
    display: grid;
    gap: 10px;
    margin-top: 14px;
}

.preview-panel {
    position: sticky;
    top: 18px;
}

.help-text {
    color: var(--muted);
    font-size: 13px;
}

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

.option-preview {
    display: grid;
    gap: 6px;
    color: var(--muted);
}

.matrix-check {
    display: inline-grid;
    place-items: center;
    width: 24px;
    height: 24px;
}

.matrix-check input {
    width: auto;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
}

.auth-page {
    display: grid;
    min-height: 100vh;
    place-items: center;
    padding: 20px;
}

.auth-card {
    width: min(420px, 100%);
    padding: 28px;
}

.auth-brand {
    margin-bottom: 24px;
    color: var(--text);
}

.stacked-form {
    display: grid;
    gap: 14px;
    margin-top: 18px;
}

.stacked-form label {
    display: grid;
    gap: 6px;
    font-weight: 600;
}

.check-row {
    grid-template-columns: auto 1fr;
    align-items: center;
    color: var(--muted);
    font-weight: 400;
}

.check-row input {
    width: auto;
}

@media (max-width: 900px) {
    .app-shell {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: static;
    }

    .metric-grid,
    .panel-grid,
    .split-grid,
    .builder-grid,
    .field-editor-grid {
        grid-template-columns: 1fr;
    }

    .topbar,
    .topbar-actions,
    .panel-heading {
        align-items: flex-start;
        flex-direction: column;
    }
}