/* ==============================================
   Fair Share Calculator - Styles
   Uses CSS variables from main.css for dark/light mode
   ============================================== */

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

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

.fair-share-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);
}

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

.fair-share-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. Person Input Cards
   ============================================== */
.fs-persons-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.fs-person-card {
    padding: var(--space-6);
    background: var(--background);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

.fs-person-card h3 {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

.fs-field {
    margin-bottom: var(--space-4);
}

.fs-field:last-child {
    margin-bottom: 0;
}

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

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

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

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

/* ==============================================
   3. Expenses Section
   ============================================== */
.fs-expenses-section {
    margin-bottom: var(--space-6);
}

.fs-expenses-section 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);
}

.fs-expense-row {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-2);
}

.fs-expense-row .fs-expense-name {
    flex: 1;
    min-width: 0;
}

.fs-expense-row .fs-input-wrapper {
    width: 160px;
    flex-shrink: 0;
}

.fs-btn-remove {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: color var(--transition-fast), background var(--transition-fast);
    flex-shrink: 0;
}

.fs-btn-remove:hover {
    color: var(--error);
    background: rgba(239, 68, 68, 0.1);
}

.fs-btn-add {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--primary);
    background: transparent;
    border: 1px dashed var(--primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast);
    margin-top: var(--space-3);
}

.fs-btn-add:hover {
    background: var(--primary-light);
}

.fs-btn-add svg {
    width: 16px;
    height: 16px;
}

/* ==============================================
   4. Calculate Button
   ============================================== */
.fair-share-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);
}

.fair-share-calculate-btn:hover {
    background: var(--primary-hover);
}

.fair-share-calculate-btn:active {
    transform: scale(0.99);
}

/* ==============================================
   5. Result Card
   ============================================== */
.fair-share-result {
    display: none;
}

.fair-share-result.visible {
    display: block;
}

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

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

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

/* ==============================================
   6. Share Bar Visualization
   ============================================== */
.fs-share-visual {
    margin-bottom: var(--space-8);
}

.fs-share-bar-container {
    max-width: 100%;
}

.fs-share-bar {
    display: flex;
    height: 48px;
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--space-2);
}

.fs-share-bar-a {
    background: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    font-weight: var(--font-semibold);
    font-size: var(--text-lg);
    min-width: 60px;
    transition: width 0.5s ease;
}

.fs-share-bar-b {
    background: var(--secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-inverse);
    font-weight: var(--font-semibold);
    font-size: var(--text-lg);
    min-width: 60px;
    transition: width 0.5s ease;
}

.fs-share-labels {
    display: flex;
    justify-content: space-between;
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

/* ==============================================
   7. Result Person Cards
   ============================================== */
.fs-result-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.fs-result-person {
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.fs-result-person-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-5);
}

.fs-result-person-header h3 {
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--text-inverse);
    margin: 0;
}

.fs-result-percent {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--text-inverse);
}

.fs-color-a {
    background: var(--primary);
}

.fs-color-b {
    background: var(--secondary);
}

.fs-result-person-body {
    padding: var(--space-4) var(--space-5);
}

.fs-result-stat {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-2) 0;
    border-bottom: 1px solid var(--border-light);
}

.fs-result-stat:last-child {
    border-bottom: none;
}

.fs-result-stat-highlight {
    background: var(--background);
    margin: var(--space-2) calc(-1 * var(--space-5));
    padding: var(--space-3) var(--space-5);
    border-bottom: none;
}

.fs-result-stat-label {
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.fs-result-stat-value {
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
}

.fs-negative {
    color: var(--error);
}

/* ==============================================
   8. Expense Breakdown Table
   ============================================== */
.fs-expense-breakdown {
    margin-top: var(--space-6);
}

.fs-expense-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);
}

/* ==============================================
   9. Error Message
   ============================================== */
.fs-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;
}

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

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

.fair-share-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;
}

.fair-share-faq {
    margin-top: var(--space-10);
}

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

.fair-share-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;
}

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

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

/* CTA */
.fair-share-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);
}

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

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

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

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

    .fair-share-hero p {
        font-size: var(--text-base);
    }

    .fair-share-card {
        padding: var(--space-4);
    }

    .fs-persons-grid {
        grid-template-columns: 1fr;
    }

    .fs-result-cards {
        grid-template-columns: 1fr;
    }

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

    .fs-expense-row {
        flex-wrap: wrap;
    }

    .fs-expense-row .fs-input-wrapper {
        width: 120px;
    }
}

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

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

    .fs-person-card {
        padding: var(--space-4);
    }

    .fs-share-bar {
        height: 40px;
    }

    .fs-share-bar-a,
    .fs-share-bar-b {
        font-size: var(--text-sm);
        min-width: 50px;
    }
}

/* ==============================================
   12. Print
   ============================================== */
@media print {
    .fair-share-card:first-of-type {
        display: none;
    }

    .fair-share-result {
        display: block !important;
    }

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