:root {
    --primary: #0F5F5A;
    --primary-dark: #0A4541;
    --page-bg: #F4F7F7;
    --surface: #FFFFFF;
    --surface-alt: #F7FAFA;
    --border: #D8E1E0;
    --popup-border: #C9D7D5;
    --table-header: #E8F0EF;
    --text: #152928;
    --heading: #123836;
    --header-text: #243B3A;
    --muted: #607372;
    --field-label: #536967;
    --danger-bg: #F6E8E8;
    --danger: #9A1F1F;
}

* { box-sizing: border-box; }
html, body, #app { height: 100%; margin: 0; }
body { background: var(--page-bg); color: var(--text); font-family: OpenSansRegular, Segoe UI, Arial, sans-serif; }
button, input, select { font: inherit; }

.app-shell { display: grid; grid-template-columns: 210px minmax(0, 1fr); min-height: 100%; }
.side-nav { background: var(--surface); border-right: 1px solid var(--border); padding: 18px 14px; }
.brand { color: var(--heading); font-family: OpenSansSemibold, Segoe UI, Arial, sans-serif; font-size: 20px; margin-bottom: 18px; }
.side-nav a { color: var(--text); display: block; padding: 10px 12px; text-decoration: none; }
.side-nav a.active { background: var(--table-header); color: var(--primary); font-family: OpenSansSemibold, Segoe UI, Arial, sans-serif; }
.main-surface { min-width: 0; padding: 18px; }

.home-page h1 { color: var(--heading); margin: 0 0 16px; }
.primary-link, .primary-button { background: var(--primary); border: 0; color: white; cursor: pointer; display: inline-flex; align-items: center; min-height: 38px; padding: 0 18px; text-decoration: none; }
.primary-button:hover, .primary-link:hover { background: var(--primary-dark); }

.item-master-page { outline: none; }
.toolbar { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 12px; margin-bottom: 12px; }
.search-input, input, select { background: var(--surface); border: 1px solid var(--border); color: var(--text); min-height: 38px; padding: 0 10px; }
.search-input { width: 100%; }

.item-table { background: var(--surface); border: 1px solid var(--border); border-collapse: collapse; table-layout: fixed; width: 100%; }
.item-table th { background: var(--table-header); color: var(--header-text); font-family: OpenSansSemibold, Segoe UI, Arial, sans-serif; font-size: 12px; height: 34px; padding: 0 8px; text-align: left; }
.item-table td { border-top: 1px solid var(--border); font-size: 13px; height: 36px; overflow: hidden; padding: 0 8px; text-overflow: ellipsis; white-space: nowrap; }
.item-table tr { cursor: default; }
.item-table tr:hover td { background: var(--surface-alt); }
.item-table .number { text-align: right; }
.empty-cell { color: var(--muted); text-align: center; }

.dialog-scrim { align-items: center; background: rgba(0, 0, 0, .4); display: flex; inset: 0; justify-content: center; padding: 18px; position: fixed; z-index: 10; }
.item-dialog { background: var(--surface); border: 1px solid var(--popup-border); max-width: 760px; padding: 18px; width: min(760px, 100%); }
.dialog-header { align-items: center; display: grid; grid-template-columns: 1fr auto; gap: 12px; margin-bottom: 14px; }
.dialog-header h2 { color: var(--heading); font-size: 18px; margin: 0; }
.ghost-button { background: transparent; border: 0; color: var(--primary); cursor: pointer; font-family: OpenSansSemibold, Segoe UI, Arial, sans-serif; }
.dialog-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px 14px; }
.dialog-grid label, .field-block { display: grid; gap: 4px; }
.dialog-grid span, .field-block > span { color: var(--field-label); font-size: 12px; }
.inline-add { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; }
.small-primary { background: var(--primary); border: 0; color: white; cursor: pointer; min-height: 38px; padding: 0 12px; }
.type-list { background: var(--surface-alt); border: 1px solid var(--border); height: 96px; overflow: auto; }
.type-option { background: transparent; border: 0; color: var(--text); cursor: pointer; display: block; min-height: 30px; padding: 0 8px; text-align: left; width: 100%; }
.type-option:hover { background: var(--table-header); }
.dialog-actions { display: grid; grid-template-columns: auto 1fr auto auto; gap: 10px; margin-top: 14px; }
.secondary-button { background: transparent; border: 1px solid var(--primary); color: var(--primary); cursor: pointer; min-height: 38px; padding: 0 16px; }
.danger-button { background: var(--danger-bg); border: 0; color: var(--danger); cursor: pointer; min-height: 38px; padding: 0 14px; }
.empty-state { color: var(--muted); padding: 24px; }

@media (max-width: 720px) {
    .app-shell { grid-template-columns: 1fr; }
    .side-nav { border-bottom: 1px solid var(--border); border-right: 0; display: flex; gap: 8px; padding: 10px; }
    .brand { margin: 0 10px 0 0; }
    .side-nav a { padding: 8px 10px; }
    .main-surface { padding: 10px; }
    .toolbar { grid-template-columns: 1fr; }
    .dialog-grid { grid-template-columns: 1fr; }
    .dialog-actions { grid-template-columns: 1fr; }
    .item-table { min-width: 680px; }
    .item-master-page { overflow-x: auto; }
}

.error-banner { background: var(--danger-bg); border: 1px solid var(--danger); color: var(--danger); margin-bottom: 12px; padding: 8px 10px; }

.auth-page { display: flex; justify-content: center; padding: 32px 16px; }
.auth-card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; max-width: 520px; padding: 24px; width: min(520px, 100%); }
.auth-header { display: grid; gap: 6px; margin-bottom: 18px; }
.auth-header h1 { color: var(--heading); font-size: 24px; margin: 0; }
.auth-header p { color: var(--muted); margin: 0; }
.auth-steps { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.auth-steps span { background: var(--surface-alt); border: 1px solid var(--border); border-radius: 999px; color: var(--muted); font-size: 12px; padding: 6px 10px; }
.auth-steps span.active { background: var(--table-header); border-color: var(--primary); color: var(--primary); font-family: OpenSansSemibold, Segoe UI, Arial, sans-serif; }
.auth-section { display: grid; gap: 12px; }
.field-label { color: var(--field-label); font-size: 12px; }
.phone-row { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 8px; }
.phone-prefix { align-items: center; background: var(--surface-alt); border: 1px solid var(--border); display: inline-flex; min-height: 40px; padding: 0 12px; }
.text-input { background: var(--surface); border: 1px solid var(--border); border-radius: 6px; color: var(--text); min-height: 40px; padding: 0 12px; width: 100%; }
.auth-actions-row { display: flex; flex-wrap: wrap; gap: 10px; }
.summary-chip { background: var(--table-header); border-radius: 999px; color: var(--primary); display: inline-flex; font-size: 12px; padding: 8px 12px; width: fit-content; }
.pin-length-group { display: grid; gap: 8px; }
.segmented-row { display: flex; gap: 8px; }
.segment-button { background: var(--surface); border: 1px solid var(--border); color: var(--text); cursor: pointer; min-height: 38px; min-width: 56px; }
.segment-button.active { background: var(--primary); border-color: var(--primary); color: white; }
.auth-help-text { color: var(--muted); line-height: 1.5; margin: 0; }