/* ==============================================
   50/30/20 Budget Calculator - Styles
   Uses CSS variables from main.css for dark/light mode
   ============================================== */

/* ==============================================
   1. Tool Layout
   ============================================== */
.budget-calc-tool {
    padding: calc(var(--space-16) + 60px) 0 var(--space-16);
}

.budget-calc-hero {
    text-align: center;
    margin-bottom: var(--space-10);
}

.budget-calc-hero h1 {
    font-size: var(--text-4xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    line-height: var(--leading-tight);
}

.budget-calc-hero p {
    font-size: var(--text-lg);
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto;
    line-height: var(--leading-relaxed);
}

.budget-calc-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    margin-bottom: var(--space-8);
    box-shadow: var(--shadow-sm);
}

/* ==============================================
   2. Income Input Section
   ============================================== */
.bc-income-section {
    margin-bottom: var(--space-8);
}

.bc-income-fields {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-6);
    margin-bottom: var(--space-6);
}

.bc-income-fields:has(.bc-field + .bc-field) {
    grid-template-columns: 1fr 1fr;
}

.bc-field {
    display: flex;
    flex-direction: column;
}

.bc-field label {
    display: block;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
}

.bc-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.bc-input-wrapper .form-input {
    padding-right: var(--space-8);
}

.bc-currency {
    position: absolute;
    right: var(--space-3);
    color: var(--text-muted);
    font-size: var(--text-sm);
    pointer-events: none;
}

/* ==============================================
   3. Couple Mode Toggle
   ============================================== */
.bc-couple-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--background);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

.bc-toggle-switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 26px;
    flex-shrink: 0;
    cursor: pointer;
}

.bc-toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.bc-toggle-slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--border);
    border-radius: var(--radius-full);
    transition: background var(--transition-fast);
}

.bc-toggle-slider::before {
    content: '';
    position: absolute;
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background: var(--surface);
    border-radius: 50%;
    transition: transform var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.bc-toggle-switch input:checked + .bc-toggle-slider {
    background: var(--primary);
}

.bc-toggle-switch input:checked + .bc-toggle-slider::before {
    transform: translateX(22px);
}

.bc-toggle-switch input:focus-visible + .bc-toggle-slider {
    box-shadow: 0 0 0 3px var(--primary-light);
}

.bc-toggle-text {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.bc-toggle-label {
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
}

.bc-toggle-hint {
    font-size: var(--text-sm);
    color: var(--text-muted);
}

/* ==============================================
   4. Percentage Sliders / Inputs
   ============================================== */
.bc-sliders {
    margin-bottom: var(--space-6);
}

.bc-sliders-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-2);
    border-bottom: 2px solid var(--border);
}

.bc-sliders-header h3 {
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: 0;
}

.bc-reset-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    padding: var(--space-1) var(--space-2);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--text-muted);
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: color var(--transition-fast), border-color var(--transition-fast);
    white-space: nowrap;
}

.bc-reset-btn:hover {
    color: var(--text-primary);
    border-color: var(--text-muted);
}

.bc-slider-row {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.bc-slider-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.bc-slider-item label {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
}

.bc-needs-accent label { color: #3B82F6; }
.bc-wants-accent label { color: #F59E0B; }
.bc-savings-accent label { color: #10B981; }

.bc-slider-input-group {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

/* Range slider */
.bc-range {
    flex: 1;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--border);
    border-radius: var(--radius-full);
    outline: none;
    cursor: pointer;
}

.bc-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid var(--surface);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.bc-range-needs::-webkit-slider-thumb { background: #3B82F6; }
.bc-range-wants::-webkit-slider-thumb { background: #F59E0B; }
.bc-range-savings::-webkit-slider-thumb { background: #10B981; }

.bc-range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid var(--surface);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.bc-range-needs::-moz-range-thumb { background: #3B82F6; }
.bc-range-wants::-moz-range-thumb { background: #F59E0B; }
.bc-range-savings::-moz-range-thumb { background: #10B981; }

/* Percentage number input */
.bc-pct-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
    width: 80px;
    flex-shrink: 0;
}

.bc-pct-input {
    text-align: center;
    padding-right: var(--space-6) !important;
    font-weight: var(--font-semibold);
    /* Hide number spinner arrows */
    -moz-appearance: textfield;
}

.bc-pct-input::-webkit-outer-spin-button,
.bc-pct-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.bc-pct-sign {
    position: absolute;
    right: var(--space-2);
    color: var(--text-muted);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    pointer-events: none;
}

/* Percentage total indicator */
.bc-percent-total {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    margin-top: var(--space-4);
    background: var(--secondary-light);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    color: var(--secondary);
    transition: background var(--transition-fast), color var(--transition-fast);
}

.bc-percent-total strong {
    font-weight: var(--font-bold);
}

.bc-percent-invalid {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
}

.bc-percent-warning {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    animation: bc-shake 0.4s ease-in-out;
}

@keyframes bc-shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-4px); }
    75% { transform: translateX(4px); }
}

/* ==============================================
   5. Calculate Button
   ============================================== */
.budget-calc-calculate-btn {
    display: block;
    width: 100%;
    padding: var(--space-4) var(--space-6);
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--text-inverse);
    background: var(--primary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    margin-top: var(--space-6);
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.budget-calc-calculate-btn:hover {
    background: var(--primary-hover);
}

.budget-calc-calculate-btn:active {
    transform: scale(0.99);
}

/* ==============================================
   6. Result Card
   ============================================== */
.budget-calc-result {
    display: none;
}

.budget-calc-result.visible {
    display: block;
}

.bc-result-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.bc-result-header h2 {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin: 0;
}

.bc-result-actions {
    display: flex;
    gap: var(--space-2);
}

/* ==============================================
   7. Donut Chart + Visual Section
   ============================================== */
.bc-visual-section {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-8);
    align-items: start;
    margin-bottom: var(--space-8);
}

.bc-donut-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
}

.bc-donut-svg {
    display: block;
}

.bc-donut-total {
    font-size: 18px;
    font-weight: 700;
    fill: var(--text-primary);
}

.bc-donut-label {
    font-size: 12px;
    fill: var(--text-muted);
}

.bc-donut-legend {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.bc-legend-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.bc-legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* ==============================================
   8. Category Cards
   ============================================== */
.bc-category-cards {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.bc-category-card {
    padding: var(--space-5);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    background: var(--background);
    transition: box-shadow var(--transition-fast);
}

.bc-category-card:hover {
    box-shadow: var(--shadow-md);
}

/* Category-specific accent borders */
.bc-category-card-needs {
    border-left: 4px solid #3B82F6;
}

.bc-category-card-wants {
    border-left: 4px solid #F59E0B;
}

.bc-category-card-savings {
    border-left: 4px solid #10B981;
}

.bc-category-icon {
    margin-bottom: var(--space-2);
}

.bc-category-card-needs .bc-category-icon { color: #3B82F6; }
.bc-category-card-wants .bc-category-icon { color: #F59E0B; }
.bc-category-card-savings .bc-category-icon { color: #10B981; }

.bc-category-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-1);
}

.bc-category-name {
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
}

.bc-category-percent {
    font-size: var(--text-sm);
    font-weight: var(--font-bold);
    color: var(--text-muted);
}

.bc-category-amount {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-2);
}

.bc-category-desc {
    font-size: var(--text-sm);
    color: var(--text-muted);
    line-height: var(--leading-relaxed);
}

/* ==============================================
   9. Couple Breakdown
   ============================================== */
.bc-couple-breakdown {
    padding: var(--space-6);
    background: var(--background);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    margin-bottom: var(--space-8);
}

.bc-couple-breakdown h3 {
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-2);
    border-bottom: 2px solid var(--border);
}

.bc-couple-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
}

.bc-couple-person h4 {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--text-secondary);
    margin-bottom: var(--space-3);
}

.bc-couple-stat {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-2) 0;
    border-bottom: 1px solid var(--border-light);
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.bc-couple-stat:last-child {
    border-bottom: none;
}

.bc-couple-stat span:last-child {
    font-weight: var(--font-semibold);
    color: var(--text-primary);
}

.bc-couple-stat-total {
    border-top: 2px solid var(--border);
    border-bottom: none;
    padding-top: var(--space-3);
    margin-top: var(--space-1);
}

.bc-couple-stat-total span {
    font-weight: var(--font-bold) !important;
    color: var(--text-primary) !important;
}

/* ==============================================
   10. Comparison Section (Actual vs Recommended)
   ============================================== */
.bc-comparison {
    padding: var(--space-6);
    background: var(--background);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    margin-bottom: var(--space-6);
}

.bc-comparison h3 {
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-2);
}

.bc-comparison-hint {
    font-size: var(--text-sm);
    color: var(--text-muted);
    margin-bottom: var(--space-6);
    line-height: var(--leading-relaxed);
}

.bc-comparison-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.bc-comparison-row {
    padding: var(--space-4);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
    background: var(--surface);
}

.bc-comparison-label {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-3);
}

.bc-comparison-values {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

.bc-comparison-field {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.bc-comparison-field-label {
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.bc-comparison-recommended {
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    padding: var(--space-2) 0;
}

.bc-comparison-input-wrap {
    max-width: 160px;
}

.bc-comparison-input-wrap .form-input {
    font-size: var(--text-base);
}

.bc-comparison-status {
    margin-top: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    text-align: center;
}

.bc-comparison-status.bc-over {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error);
}

.bc-comparison-status.bc-under {
    background: var(--secondary-light);
    color: var(--secondary);
}

.bc-comparison-status.bc-on-track {
    background: var(--secondary-light);
    color: var(--secondary);
}

/* ==============================================
   11. Error Message
   ============================================== */
.bc-error {
    padding: var(--space-4);
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--error);
    border-radius: var(--radius-md);
    color: var(--error);
    font-weight: var(--font-medium);
    text-align: center;
}

/* ==============================================
   12. SEO Content & FAQ (reuses fair-share patterns)
   ============================================== */
.budget-calc-seo-content {
    padding: var(--space-16) 0;
}

.budget-calc-seo-content h2 {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin: 0 0 var(--space-4) 0;
}

.budget-calc-seo-content p {
    font-size: var(--text-base);
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--space-4);
    max-width: 720px;
}

.budget-calc-faq {
    margin-top: var(--space-10);
}

.budget-calc-faq h2 {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin: 0 0 var(--space-6) 0;
}

.budget-calc-faq .faq-answer p {
    padding: 0 var(--space-6) var(--space-6);
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
    margin: 0;
    max-width: none;
}

.budget-calc-faq .faq-question svg {
    flex-shrink: 0;
    transition: transform var(--transition-normal);
    color: var(--text-muted);
}

.budget-calc-faq .faq-item.active .faq-question svg {
    transform: rotate(180deg);
}

/* CTA */
.budget-calc-cta {
    text-align: center;
    padding: var(--space-10) var(--space-8);
    background: var(--primary-light);
    border-radius: var(--radius-xl);
    margin-top: var(--space-10);
}

.budget-calc-cta h2 {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    margin: 0 0 var(--space-3) 0;
}

.budget-calc-cta p {
    font-size: var(--text-base);
    color: var(--text-secondary);
    margin: 0 auto var(--space-6);
    max-width: 480px;
}

/* ==============================================
   13. Responsive
   ============================================== */
@media (max-width: 768px) {
    .budget-calc-tool {
        padding: calc(var(--space-12) + 56px) 0 var(--space-12);
    }

    .budget-calc-hero h1 {
        font-size: var(--text-2xl);
    }

    .budget-calc-hero p {
        font-size: var(--text-base);
    }

    .budget-calc-card {
        padding: var(--space-4);
    }

    .bc-income-fields:has(.bc-field + .bc-field) {
        grid-template-columns: 1fr;
    }

    .bc-visual-section {
        grid-template-columns: 1fr;
        justify-items: center;
    }

    .bc-category-cards {
        width: 100%;
    }

    .bc-couple-grid {
        grid-template-columns: 1fr;
    }

    .bc-result-header {
        flex-direction: column;
    }

    .bc-comparison-values {
        grid-template-columns: 1fr;
    }

    .bc-result-actions {
        gap: var(--space-1);
    }

    .sankey-action-btn span {
        display: none;
    }
}

@media (max-width: 480px) {
    .budget-calc-hero h1 {
        font-size: var(--text-xl);
    }

    .budget-calc-card {
        padding: var(--space-3);
        border-radius: var(--radius-md);
    }

    .bc-couple-toggle {
        flex-direction: row;
        gap: var(--space-3);
    }

    .bc-donut-svg {
        width: 160px;
        height: 160px;
    }

    .bc-category-card {
        padding: var(--space-4);
    }

    .bc-category-amount {
        font-size: var(--text-xl);
    }

    .bc-slider-input-group {
        flex-wrap: wrap;
    }

    .bc-range {
        width: 100%;
        min-width: 0;
    }

    .bc-pct-input-wrap {
        width: 70px;
    }
}

/* ==============================================
   14. Print
   ============================================== */
@media print {
    .budget-calc-card:first-of-type {
        display: none;
    }

    .budget-calc-result {
        display: block !important;
    }

    .bc-result-actions {
        display: none;
    }

    .bc-comparison {
        break-inside: avoid;
    }

    .bc-couple-breakdown {
        break-inside: avoid;
    }
}