/* ═══════════════════════════════════════════════════════════════════════════
 * avg-return-calc.css
 * Average Return Calculator — CalculatorFix
 * Namespace: arc- (avoids conflicts with global stylesheet)
 * ═══════════════════════════════════════════════════════════════════════════ */

/* ── CSS Custom Properties (local overrides / additions) ─────────────────── */
.arc-calc {
    --arc-radius:        8px;
    --arc-radius-sm:     5px;
    --arc-radius-lg:     12px;
    --arc-shadow-card:   0 1px 3px rgba(15, 23, 42, .08), 0 1px 2px rgba(15, 23, 42, .06);
    --arc-shadow-focus:  0 0 0 3px rgba(14, 165, 233, .18);
    --arc-transition:    0.18s ease;
    --arc-pos-color:     var(--clr-green, #22c55e);
    --arc-neg-color:     #ef4444;
    --arc-pos-bg:        #f0fdf4;
    --arc-neg-bg:        #fef2f2;
    --arc-bar-zero:      var(--clr-border, #e2e8f0);
}

/* ── Widget wrapper ──────────────────────────────────────────────────────── */
.arc-calc {
    font-family: inherit;
    color: var(--clr-text-primary, #0f172a);
}

.arc-calc .calc-widget-heading {
    margin-bottom: 1.25rem;
}

/* ── Mode Toggle ─────────────────────────────────────────────────────────── */
.arc-mode-toggle {
    display: flex;
    gap: 6px;
    background: var(--clr-bg-muted, #f1f5f9);
    border: 1px solid var(--clr-border, #e2e8f0);
    border-radius: var(--arc-radius);
    padding: 4px;
    margin-bottom: 1.25rem;
    width: 100%;
    box-sizing: border-box;
}

.arc-mode-btn {
    flex: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    padding: 8px 12px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--clr-text-secondary, #475569);
    background: transparent;
    border: 1px solid transparent;
    border-radius: calc(var(--arc-radius) - 2px);
    cursor: pointer;
    transition: background var(--arc-transition), color var(--arc-transition), border-color var(--arc-transition);
    white-space: nowrap;
    user-select: none;
    line-height: 1;
}

.arc-mode-btn svg {
    flex-shrink: 0;
    transition: opacity var(--arc-transition);
}

.arc-mode-btn:hover:not(.arc-mode-btn--active) {
    background: var(--clr-bg, #fff);
    color: var(--clr-text-primary, #0f172a);
    border-color: var(--clr-border, #e2e8f0);
}

.arc-mode-btn--active {
    background: var(--clr-bg, #fff);
    color: var(--clr-accent-dark, #0369a1);
    border-color: var(--clr-border, #e2e8f0);
    box-shadow: var(--arc-shadow-card);
    font-weight: 600;
}

/* ── Panel ───────────────────────────────────────────────────────────────── */
.arc-panel {
    display: block;
}

.arc-panel--hidden {
    display: none;
}

.arc-panel-hint {
    font-size: 0.8rem;
    color: var(--clr-text-muted, #94a3b8);
    margin: 0 0 0.85rem;
    line-height: 1.5;
}

/* ── Returns Table ───────────────────────────────────────────────────────── */
.arc-returns-table-wrap {
    overflow-x: auto;
    border: 1px solid var(--clr-border, #e2e8f0);
    border-radius: var(--arc-radius);
    margin-bottom: 0.75rem;
}

.arc-returns-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
    min-width: 320px;
}

.arc-returns-table thead tr {
    background: var(--clr-bg-muted, #f1f5f9);
    border-bottom: 1px solid var(--clr-border, #e2e8f0);
}

.arc-returns-table th {
    padding: 8px 10px;
    text-align: left;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--clr-text-secondary, #475569);
    letter-spacing: 0.02em;
    white-space: nowrap;
}

.arc-returns-table th:first-child {
    width: 42px;
    text-align: center;
    color: var(--clr-text-muted, #94a3b8);
}

.arc-th-action {
    width: 38px;
}

.arc-optional {
    font-weight: 400;
    font-size: 0.7rem;
    color: var(--clr-text-muted, #94a3b8);
}

/* Table body rows */
.arc-returns-table tbody tr {
    border-bottom: 1px solid var(--clr-border-soft, #f1f5f9);
    transition: background var(--arc-transition);
}

.arc-returns-table tbody tr:last-child {
    border-bottom: none;
}

.arc-returns-table tbody tr:hover {
    background: var(--clr-bg-soft, #f8fafc);
}

.arc-returns-table td {
    padding: 6px 8px;
    vertical-align: middle;
}

.arc-returns-table td:first-child {
    text-align: center;
    font-size: 0.72rem;
    color: var(--clr-text-muted, #94a3b8);
    font-weight: 500;
}

/* Inline table inputs */
.arc-tbl-input {
    width: 100%;
    padding: 6px 8px;
    font-size: 0.8125rem;
    color: var(--clr-text-primary, #0f172a);
    background: var(--clr-bg, #fff);
    border: 1px solid var(--clr-border, #e2e8f0);
    border-radius: var(--arc-radius-sm);
    outline: none;
    transition: border-color var(--arc-transition), box-shadow var(--arc-transition);
    box-sizing: border-box;
    -moz-appearance: textfield;
}

.arc-tbl-input::-webkit-outer-spin-button,
.arc-tbl-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
}

.arc-tbl-input:focus {
    border-color: var(--clr-accent, #0ea5e9);
    box-shadow: var(--arc-shadow-focus);
}

.arc-tbl-input--label {
    min-width: 80px;
}

.arc-tbl-input--return {
    min-width: 72px;
    text-align: right;
}

/* Remove row button */
.arc-btn-remove {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border: 1px solid var(--clr-border, #e2e8f0);
    border-radius: 50%;
    background: transparent;
    color: var(--clr-text-muted, #94a3b8);
    cursor: pointer;
    transition: background var(--arc-transition), color var(--arc-transition), border-color var(--arc-transition);
    padding: 0;
}

.arc-btn-remove:hover {
    background: #fef2f2;
    border-color: #fca5a5;
    color: #ef4444;
}

.arc-btn-remove:disabled {
    opacity: .35;
    cursor: not-allowed;
    pointer-events: none;
}

/* ── Table Footer ────────────────────────────────────────────────────────── */
.arc-table-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.9rem;
    flex-wrap: wrap;
    gap: 8px;
}

.arc-btn-add-row {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--clr-accent-dark, #0369a1);
    background: var(--clr-accent-light, #e0f2fe);
    border: 1px solid #bae6fd;
    border-radius: var(--arc-radius-sm);
    cursor: pointer;
    transition: background var(--arc-transition), border-color var(--arc-transition);
}

.arc-btn-add-row:hover {
    background: var(--clr-accent-hover, #bae6fd);
    border-color: #7dd3fc;
}

.arc-row-count {
    font-size: 0.75rem;
    color: var(--clr-text-muted, #94a3b8);
}

/* ── Period Type Row ─────────────────────────────────────────────────────── */
.arc-period-type-row {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    padding: 10px 12px;
    background: var(--clr-bg-soft, #f8fafc);
    border: 1px solid var(--clr-border, #e2e8f0);
    border-radius: var(--arc-radius);
    margin-bottom: 1rem;
}

.arc-inline-label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--clr-text-secondary, #475569);
    white-space: nowrap;
}

/* ── Select ──────────────────────────────────────────────────────────────── */
.arc-select {
    padding: 6px 28px 6px 10px;
    font-size: 0.8125rem;
    color: var(--clr-text-primary, #0f172a);
    background: var(--clr-bg, #fff) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2394a3b8' stroke-width='1.4' stroke-linecap='round' fill='none'/%3E%3C/svg%3E") no-repeat right 10px center;
    border: 1px solid var(--clr-border, #e2e8f0);
    border-radius: var(--arc-radius-sm);
    outline: none;
    appearance: none;
    -webkit-appearance: none;
    cursor: pointer;
    transition: border-color var(--arc-transition), box-shadow var(--arc-transition);
}

.arc-select:focus {
    border-color: var(--clr-accent, #0ea5e9);
    box-shadow: var(--arc-shadow-focus);
}

/* ── Start/End Value Grid ────────────────────────────────────────────────── */
.arc-sev-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px 16px;
    margin-bottom: 1rem;
}

.arc-field-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.arc-field-group--sm {
    grid-column: 1 / -1;
    max-width: 160px;
}

.arc-label {
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--clr-text-primary, #0f172a);
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.arc-label-sub {
    font-size: 0.72rem;
    font-weight: 400;
    color: var(--clr-text-muted, #94a3b8);
}

.arc-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.arc-prefix,
.arc-suffix {
    position: absolute;
    font-size: 0.8125rem;
    color: var(--clr-text-muted, #94a3b8);
    pointer-events: none;
    user-select: none;
    z-index: 1;
}

.arc-prefix { left: 10px; }
.arc-suffix { right: 10px; }

.arc-input {
    width: 100%;
    padding: 8px 10px 8px 26px;
    font-size: 0.875rem;
    color: var(--clr-text-primary, #0f172a);
    background: var(--clr-bg, #fff);
    border: 1px solid var(--clr-border, #e2e8f0);
    border-radius: var(--arc-radius-sm);
    outline: none;
    box-sizing: border-box;
    transition: border-color var(--arc-transition), box-shadow var(--arc-transition);
    -moz-appearance: textfield;
}

.arc-input::-webkit-outer-spin-button,
.arc-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
}

.arc-input:focus {
    border-color: var(--clr-accent, #0ea5e9);
    box-shadow: var(--arc-shadow-focus);
}

.arc-input--no-pfx {
    padding-left: 10px;
    padding-right: 36px;
}

.arc-field-hint {
    font-size: 0.72rem;
    color: var(--clr-text-muted, #94a3b8);
    line-height: 1.4;
}

.arc-custom-period-input {
    width: 100px;
    padding: 6px 10px;
    font-size: 0.8125rem;
    border: 1px solid var(--clr-border, #e2e8f0);
    border-radius: var(--arc-radius-sm);
    outline: none;
    transition: border-color var(--arc-transition), box-shadow var(--arc-transition);
}

.arc-custom-period-input:focus {
    border-color: var(--clr-accent, #0ea5e9);
    box-shadow: var(--arc-shadow-focus);
}

/* ── Action Buttons ──────────────────────────────────────────────────────── */
.arc-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 0.25rem;
    flex-wrap: wrap;
}

.arc-calc-submit {
    flex: 1;
    min-width: 140px;
    max-width: 240px;
}

.arc-btn-clear {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 16px;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--clr-text-secondary, #475569);
    background: var(--clr-bg-soft, #f8fafc);
    border: 1px solid var(--clr-border, #e2e8f0);
    border-radius: var(--arc-radius);
    cursor: pointer;
    transition: background var(--arc-transition), color var(--arc-transition), border-color var(--arc-transition);
}

.arc-btn-clear:hover {
    background: #fef2f2;
    border-color: #fca5a5;
    color: #dc2626;
}

/* ── Error ───────────────────────────────────────────────────────────────── */
.arc-error {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    margin-top: 0.85rem;
    padding: 10px 12px;
    background: #fef2f2;
    border: 1px solid #fca5a5;
    border-radius: var(--arc-radius-sm);
    color: #dc2626;
    font-size: 0.8125rem;
    line-height: 1.5;
}

.arc-error svg {
    flex-shrink: 0;
    margin-top: 1px;
    color: #dc2626;
}

/* ── Results Panel ───────────────────────────────────────────────────────── */
.arc-results {
    margin-top: 1.5rem;
    border-top: 1px solid var(--clr-border, #e2e8f0);
    padding-top: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.arc-results-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--clr-text-primary, #0f172a);
}

/* Primary metrics grid */
.arc-metrics-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

@media (min-width: 520px) {
    .arc-metrics-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.arc-metric {
    background: var(--clr-bg-soft, #f8fafc);
    border: 1px solid var(--clr-border, #e2e8f0);
    border-radius: var(--arc-radius);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    transition: border-color var(--arc-transition);
}

.arc-metric--primary {
    background: var(--clr-accent-light, #e0f2fe);
    border-color: #bae6fd;
}

.arc-metric-label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--clr-text-secondary, #475569);
}

.arc-metric--primary .arc-metric-label {
    color: var(--clr-accent-dark, #0369a1);
}

.arc-metric-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--clr-text-primary, #0f172a);
    line-height: 1.1;
    margin: 3px 0 2px;
}

.arc-metric--primary .arc-metric-value {
    color: var(--clr-accent-dark, #0369a1);
    font-size: 1.35rem;
}

.arc-metric-sub {
    font-size: 0.68rem;
    color: var(--clr-text-muted, #94a3b8);
    line-height: 1.3;
}

/* Colour coding for positive / negative values */
.arc-metric-value.arc-val-pos { color: #16a34a; }
.arc-metric-value.arc-val-neg { color: #dc2626; }
.arc-metric--primary .arc-metric-value.arc-val-pos { color: #15803d; }
.arc-metric--primary .arc-metric-value.arc-val-neg { color: #dc2626; }

/* Secondary strip */
.arc-secondary-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 0;
    background: var(--clr-bg-soft, #f8fafc);
    border: 1px solid var(--clr-border, #e2e8f0);
    border-radius: var(--arc-radius);
    overflow: hidden;
}

.arc-sec-item {
    flex: 1;
    min-width: 80px;
    display: flex;
    flex-direction: column;
    gap: 3px;
    padding: 10px 12px;
}

.arc-sec-sep {
    width: 1px;
    background: var(--clr-border, #e2e8f0);
    flex-shrink: 0;
}

.arc-sec-label {
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--clr-text-muted, #94a3b8);
}

.arc-sec-val {
    font-size: 0.9375rem;
    font-weight: 700;
    color: var(--clr-text-primary, #0f172a);
}

.arc-col-pos { color: #16a34a; }
.arc-col-neg { color: #dc2626; }
.arc-col-muted { color: var(--clr-text-secondary, #475569); }

/* Value summary (start/end mode) */
.arc-value-summary {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    background: var(--clr-bg-soft, #f8fafc);
    border: 1px solid var(--clr-border, #e2e8f0);
    border-radius: var(--arc-radius);
    padding: 12px 14px;
}

.arc-vs-cell {
    display: flex;
    flex-direction: column;
    gap: 2px;
    flex: 1;
    min-width: 80px;
}

.arc-vs-arrow {
    color: var(--clr-text-muted, #94a3b8);
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.arc-vs-label {
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--clr-text-muted, #94a3b8);
}

.arc-vs-val {
    font-size: 1rem;
    font-weight: 700;
    color: var(--clr-text-primary, #0f172a);
}

/* ── Bar Chart ───────────────────────────────────────────────────────────── */
.arc-bar-chart {
    border: 1px solid var(--clr-border, #e2e8f0);
    border-radius: var(--arc-radius);
    padding: 14px;
    background: var(--clr-bg-soft, #f8fafc);
}

.arc-chart-title {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--clr-text-secondary, #475569);
    margin: 0 0 10px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.arc-bars-wrap {
    display: flex;
    align-items: flex-end;
    justify-content: flex-start;
    gap: 4px;
    height: 90px;
    position: relative;
    overflow-x: auto;
    padding-bottom: 22px; /* label space */
}

/* Zero axis line */
.arc-bars-wrap::before {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--clr-border, #e2e8f0);
    top: 50%;
    pointer-events: none;
}

/* Mean line — injected by JS as a positioned element */
.arc-mean-line {
    position: absolute;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--clr-interest, #fbbf24);
    opacity: 0.85;
    pointer-events: none;
}

/* Individual bar columns */
.arc-bar-col {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-shrink: 0;
    position: relative;
    width: 22px;
}

.arc-bar-rect {
    width: 100%;
    border-radius: 3px 3px 0 0;
    min-height: 2px;
    transition: opacity 0.12s;
}

.arc-bar-rect:hover {
    opacity: .8;
}

.arc-bar-rect--pos {
    background: var(--arc-pos-color);
}

.arc-bar-rect--neg {
    background: var(--arc-neg-color);
    border-radius: 0 0 3px 3px;
}

.arc-bar-label {
    position: absolute;
    bottom: -20px;
    font-size: 0.6rem;
    color: var(--clr-text-muted, #94a3b8);
    white-space: nowrap;
    text-align: center;
    transform: rotate(-35deg);
    transform-origin: top center;
    max-width: 40px;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Tooltip (on hover) */
.arc-bar-tooltip {
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--clr-text-primary, #0f172a);
    color: #fff;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 3px 7px;
    border-radius: 4px;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.12s;
    z-index: 10;
}

.arc-bar-col:hover .arc-bar-tooltip {
    opacity: 1;
}

/* Chart Legend */
.arc-chart-legend {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.arc-legend-dot {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 2px;
    flex-shrink: 0;
}

.arc-legend-dot.arc-legend-pos { background: var(--arc-pos-color); }
.arc-legend-dot.arc-legend-neg { background: var(--arc-neg-color); }

.arc-legend-line {
    display: inline-block;
    width: 16px;
    height: 2px;
    background: var(--clr-interest, #fbbf24);
    border-radius: 2px;
    flex-shrink: 0;
}

.arc-legend-label {
    font-size: 0.72rem;
    color: var(--clr-text-secondary, #475569);
}

/* ── Interpretation note ─────────────────────────────────────────────────── */
.arc-interpretation {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 10px 12px;
    background: var(--clr-warning-bg, #fffbeb);
    border: 1px solid var(--clr-warning-brd, #fde68a);
    border-radius: var(--arc-radius-sm);
    color: var(--clr-warning-text, #b45309);
    font-size: 0.8rem;
    line-height: 1.55;
}

.arc-interpretation svg {
    flex-shrink: 0;
    margin-top: 1px;
    color: var(--clr-interest, #fbbf24);
}

.arc-interpretation p {
    margin: 0;
}

/* ── Disclaimer ──────────────────────────────────────────────────────────── */
.arc-disclaimer {
    font-size: 0.72rem;
    color: var(--clr-text-muted, #94a3b8);
    margin: 0;
    padding-top: 0.25rem;
    border-top: 1px solid var(--clr-border-soft, #f1f5f9);
    line-height: 1.5;
}

/* ── Screen reader only ──────────────────────────────────────────────────── */
.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;
}

/* ── Responsive: Mobile ──────────────────────────────────────────────────── */
@media (max-width: 540px) {

    .arc-mode-btn {
        font-size: 0.75rem;
        padding: 7px 8px;
        gap: 5px;
    }

    .arc-sev-grid {
        grid-template-columns: 1fr;
    }

    .arc-field-group--sm {
        max-width: 100%;
    }

    .arc-metrics-grid {
        grid-template-columns: 1fr 1fr;
    }

    .arc-metric-value {
        font-size: 1.1rem;
    }

    .arc-metric--primary .arc-metric-value {
        font-size: 1.2rem;
    }

    .arc-secondary-strip {
        flex-wrap: wrap;
    }

    .arc-sec-sep {
        display: none;
    }

    .arc-sec-item {
        flex-basis: calc(50% - 1px);
        border-bottom: 1px solid var(--clr-border, #e2e8f0);
    }

    .arc-sec-item:nth-last-child(-n+2) {
        border-bottom: none;
    }

    .arc-value-summary {
        flex-direction: column;
        align-items: flex-start;
    }

    .arc-vs-arrow {
        transform: rotate(90deg);
    }

    .arc-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .arc-calc-submit {
        max-width: 100%;
    }

    .arc-period-type-row {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* ── Responsive: Tablet ──────────────────────────────────────────────────── */
@media (min-width: 541px) and (max-width: 768px) {
    .arc-sev-grid {
        grid-template-columns: 1fr 1fr;
    }
}