/* ==========================================================================
   CALCULATOR PAGE STYLES
   ========================================================================== */

/* Design System Variables - Production Calculator UI */
:root {
    /* Brand Colors - Single primary + one accent */
    --calc-color-primary: #3296a5;
    --calc-color-accent: #3296a5;

    /* Neutrals - Minimal palette */
    --calc-color-text: #1F2937;
    --calc-color-text-secondary: #6B7280;
    --calc-color-border: #E5E7EB;
    --calc-color-background: #FFFFFF;
    --calc-color-background-subtle: #F9FAFB;

    /* Functional */
    --calc-color-error: #DC2626;
    --calc-color-success: #059669;

    /* Typography Scale */
    --calc-font-family: 'Work Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --calc-font-mono: 'IBM Plex Mono', 'Courier New', monospace;

    --calc-text-xs: 0.75rem;
    --calc-text-sm: 0.875rem;
    --calc-text-base: 1rem;
    --calc-text-lg: 1.125rem;
    --calc-text-xl: 1.25rem;
    --calc-text-2xl: 1.5rem;
    --calc-text-3xl: 2rem;

    /* Spacing Scale (8px base) */
    --calc-space-1: 0.5rem;
    --calc-space-2: 1rem;
    --calc-space-3: 1.5rem;
    --calc-space-4: 2rem;
    --calc-space-5: 2.5rem;
    --calc-space-6: 3rem;

    /* Layout */
    --calc-container-max: 1280px;
    --calc-panel-max: 600px;
    --calc-border-radius: 2px;
    --calc-input-height: 48px;
}

/* Base Styles */
.calc-page {
    font-family: var(--calc-font-family);
    font-size: var(--calc-text-base);
    line-height: 1.5;
    color: var(--calc-color-text);
    background: var(--calc-color-background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Scoped reset - only for calculator content, excluding navbar and footer */
.calc-header *,
.calc-container *,
.calc-layout *,
.calc-faq * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Page Header */
.calc-header {
    background: var(--calc-color-background);
    border-bottom: 1px solid var(--calc-color-border);
    padding: 6px 0 0 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

/* Container */
.calc-container {
    max-width: var(--calc-container-max);
    margin: 0 auto;
    padding: 0 var(--calc-space-3);
}

/* Breadcrumb */
.calc-breadcrumb {
    display: flex;
    gap: var(--calc-space-1);
    font-size: var(--calc-text-sm);
    color: var(--calc-color-text-secondary);
    margin-bottom: 6px;
}

.breadcrumb-list {
    display: flex;
    list-style: none;
    padding: 0;
    margin: 0;
    gap: var(--calc-space-1);
    align-items: center;
}

.breadcrumb-list li {
    display: flex;
    align-items: center;
    gap: var(--calc-space-1);
}

.breadcrumb-list li:not(:last-child)::after {
    content: '';
    display: inline-block;
    width: 5px;
    height: 5px;
    border-right: 1.5px solid var(--calc-color-text-secondary);
    border-bottom: 1.5px solid var(--calc-color-text-secondary);
    transform: rotate(-45deg);
    opacity: 0.5;
    margin-left: 4px;
}

.calc-breadcrumb a {
    color: var(--calc-color-text-secondary);
    text-decoration: none;
    transition: color 0.15s ease;
}

.calc-breadcrumb a:hover {
    color: var(--calc-color-primary);
}

/* Page Title */
.calc-page-title {
    font-size: var(--calc-text-2xl);
    font-weight: 700;
    color: var(--calc-color-text);
    letter-spacing: -0.02em;
    line-height: 1.2;
}

/* Unit label for static percentage display */
.calc-unit-label {
    padding: 0 12px;
    color: var(--calc-color-text-secondary);
    font-weight: 500;
    display: flex;
    align-items: center;
    font-size: var(--calc-text-base);
}

/* Calculator Layout */
.calc-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--calc-space-6);
    padding: var(--calc-space-4) 0;
    align-items: start;
}

@media (max-width: 1024px) {
    .calc-layout {
        grid-template-columns: 1fr;
        gap: var(--calc-space-4);
    }
}

@media (max-width: 640px) {
    .calc-layout {
        gap: var(--calc-space-3);
    }
}

/* Input Panel */
.calc-input-panel {
    background: var(--calc-color-background);
}

/* Results Panel */
.calc-results-panel {
    border: 1px solid var(--calc-color-border);
    padding: var(--calc-space-4);
    position: sticky;
    top: 120px;
    margin-left: var(--calc-space-4);
}

@media (max-width: 1024px) {
    .calc-results-panel {
        position: static;
        margin-left: 0;
        margin-top: var(--calc-space-4); /* Add top margin instead*/
    }
}

@media (max-width: 640px) {
    .calc-results-panel {
        padding: var(--calc-space-3);
        margin-left: 0;
        margin-top: var(--calc-space-4);
    }
}

/* Form Section */
.calc-form-section {
    margin-bottom: var(--calc-space-2);
}

.calc-form-section-title {
    font-size: var(--calc-text-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--calc-color-text);
    margin-bottom: var(--calc-space-3);
    padding-bottom: var(--calc-space-2);
    border-bottom: 1px solid var(--calc-color-border);
}

/* Project Type Buttons Container */
.calc-project-types {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: left;
    padding: 14px 0;
}

.calc-project-type {
    position: relative;
    height: 55px;
    min-width: 250px;
    padding: 0 var(--calc-space-4);
    background: var(--calc-color-background);
    border: 2px solid #D1D5DB;
    border-radius: 8px;
    font-family: var(--calc-font-family);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--calc-color-text);
    cursor: pointer;
    white-space: nowrap;
    overflow: hidden;
    transition:
        color 0.2s cubic-bezier(0.4, 0, 0.2, 1),
        background 0.2s cubic-bezier(0.4, 0, 0.2, 1),
        border-color 0.2s cubic-bezier(0.4, 0, 0.2, 1),
        box-shadow 0.2s cubic-bezier(0.4, 0, 0.2, 1),
        transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
    outline: none;
}

.calc-project-type:hover {
    color: var(--calc-color-primary);
    border-color: var(--calc-color-primary);
    background: #FFFFFF;
    transform: translateY(-2px);
    box-shadow: 0 4px 14px rgba(50, 150, 165, 0.18);
}

.calc-project-type:focus-visible {
    outline: 2px solid var(--calc-color-primary);
    outline-offset: 2px;
}

.calc-project-type.active {
    color: #FFFFFF;
    background: linear-gradient(135deg, #3296a5 0%, #26b5cc 100%);
    border-color: #3296a5;
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(50, 150, 165, 0.30);
}

.calc-project-type.active:hover {
    background: linear-gradient(135deg, #26b5cc 0%, #3296a5 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(50, 150, 165, 0.35);
}

/* Subtle shimmer on active button */
.calc-project-type.active::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.12), transparent);
    animation: btn-shimmer 3.5s ease infinite;
}

@keyframes btn-shimmer {
    0%   { left: -100%; }
    50%, 100% { left: 100%; }
}

/* Input Grid */
.calc-input-grid {
    display: grid;
    gap: var(--calc-space-2);
}

/* Input Group */
.calc-input-group {
    display: flex;
    flex-direction: column;
    gap: var(--calc-space-1);
}

.calc-input-label {
    font-size: var(--calc-text-sm);
    font-weight: 500;
    color: var(--calc-color-text);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.calc-input-help {
    font-size: var(--calc-text-xs);
    color: var(--calc-color-text-secondary);
    font-weight: 400;
}

/* Input with Units */
.calc-input-with-units {
    display: flex;
    height: var(--calc-input-height);
    gap: var(--calc-space-2);
}

.calc-input-field {
    flex: 1;
    height: 100%;
    padding: 0 var(--calc-space-2);
    font-family: var(--calc-font-mono);
    font-size: var(--calc-text-base);
    color: var(--calc-color-text);
    background: var(--calc-color-background);
    border: 2px solid var(--calc-color-border);
    border-right: none;
    outline: none;
    transition: border-color 0.15s ease;
}

@media (max-width: 640px) {
    .calc-input-field {
        font-size: 16px;
        /* Prevents zoom on iOS */
        padding: 0 12px;
    }
}

.calc-input-field:focus {
    border-color: var(--calc-color-primary);
}

.calc-input-field:hover {
    border-color: var(--calc-color-text-secondary);
}

/* Unit Selector */
.calc-unit-selector {
    display: flex;
    border: 2px solid var(--calc-color-border);
}

.calc-input-field:focus+.calc-unit-selector {
    border-color: var(--calc-color-primary);
}

.calc-unit-btn {
    min-width: 48px;
    height: 100%;
    background: var(--calc-color-background-subtle);
    border: none;
    border-left: 1px solid var(--calc-color-border);
    font-family: var(--calc-font-family);
    font-size: var(--calc-text-sm);
    font-weight: 500;
    color: var(--calc-color-text-secondary);
    cursor: pointer;
    transition: all 0.15s ease;
}

@media (max-width: 640px) {
    .calc-unit-btn {
        min-width: 44px;
        padding: 0 8px;
        font-size: var(--calc-text-xs);
    }
}

.calc-unit-btn:hover {
    background: var(--calc-color-border);
}

.calc-unit-btn.active {
    background: var(--calc-color-primary);
    color: white;
}


/* Button Group */
.calc-button-group {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--calc-space-2);
}

.calc-calculate-btn {
    height: 56px;
    background: var(--calc-color-accent);
    border: none;
    font-family: var(--calc-font-family);
    font-size: var(--calc-text-base);
    font-weight: 600;
    color: white;
    cursor: pointer;
    transition: all 0.15s ease;
}

.calc-calculate-btn:hover {
    background: #26cfe9;
}

.calc-clear-btn {
    height: 56px;
    background: var(--calc-color-background);
    border: 2px solid var(--calc-color-border);
    font-family: var(--calc-font-family);
    font-size: var(--calc-text-base);
    font-weight: 500;
    color: var(--calc-color-text);
    cursor: pointer;
    transition: all 0.15s ease;
}

.calc-clear-btn:hover {
    border-color: var(--calc-color-error);
    color: var(--calc-color-error);
}

@media (max-width: 640px) {
    .calc-button-group {
        grid-template-columns: 1fr;
    }

    .calc-calculate-btn,
    .calc-clear-btn {
        height: 56px;
    }
}

/* Results Empty State */
.calc-results-empty {
    text-align: center;
    padding: var(--calc-space-2) var(--calc-space-2);
    color: var(--calc-color-text-secondary);
    font-size: var(--calc-text-sm);
}

/* Empty State Image */
.calc-empty-image {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: var(--calc-space-4);
}

.calc-illustration {
    width: 100%;
    height: auto;
    border-radius: var(--calc-border-radius);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

/* Instruction Text */
.calc-instruction-text {
    padding: 0 var(--calc-space-2) var(--calc-space-2) var(--calc-space-2);
    font-size: var(--calc-text-sm);
    font-weight: 500;
    color: var(--calc-color-text-secondary);
    text-align: left;
}

.calc-empty-text {
    margin-bottom: var(--calc-space-3);
    font-size: var(--calc-text-base);
    color: var(--calc-color-text-secondary);
}

/* Results Content */
.calc-results-content {
    display: none;
    padding: var(--calc-space-4);
}

.calc-results-content.show {
    display: block;
}

/* Result Label and Value (Simplified Design) */
.calc-result-label {
    font-size: var(--calc-text-base);
    font-weight: 500;
    color: var(--calc-color-text-secondary);
    margin-bottom: var(--calc-space-2);
}

.calc-result-value {
    font-size: var(--calc-text-3xl);
    font-weight: 800;
    color: var(--calc-color-text);
    margin-bottom: var(--calc-space-4);
    line-height: 1.2;
}

/* Disclaimer */
.calc-disclaimer {
    margin-top: var(--calc-space-3);
    margin-bottom: var(--calc-space-3);
    font-size: var(--calc-text-sm);
    color: var(--calc-color-text-secondary);
    font-style: italic;
    text-align: left;
    padding: var(--calc-space-2);
}

/* Pre-Mixed Bags Section */
.calc-bags-section {
    margin-top: var(--calc-space-4);
    padding: var(--calc-space-3);
    background: rgba(50, 150, 165, 0.05);
    border-radius: var(--calc-border-radius);
    border-left: 3px solid var(--calc-color-primary);
}

.calc-bags-header {
    font-size: var(--calc-text-lg);
    font-weight: 600;
    color: var(--calc-color-text);
    margin-bottom: var(--calc-space-2);
}

.calc-bags-options {
    display: grid;
    gap: var(--calc-space-1);
}

.calc-bag-option {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--calc-space-1) 0;
    border-bottom: 1px solid rgba(50, 150, 165, 0.1);
}

.calc-bag-option:last-child {
    border-bottom: none;
}

.calc-bag-size {
    font-weight: 500;
    color: var(--calc-color-text-secondary);
    font-size: var(--calc-text-sm);
}

.calc-bag-count {
    font-weight: 600;
    color: var(--calc-color-text);
    font-size: var(--calc-text-sm);
}

/* Result Actions */
.calc-result-actions {
    padding-top: var(--calc-space-4);
    border-top: 1px solid var(--calc-color-border);
}

.calc-action-btn {
    width: 100%;
    height: var(--calc-input-height);
    background: var(--calc-color-background);
    border: 2px solid var(--calc-color-border);
    font-family: var(--calc-font-family);
    font-size: var(--calc-text-sm);
    font-weight: 500;
    color: var(--calc-color-text);
    cursor: pointer;
    transition: all 0.15s ease;
    margin-bottom: var(--calc-space-2);
}

.calc-action-btn:hover {
    border-color: var(--calc-color-primary);
    color: var(--calc-color-primary);
}

.calc-action-btn:last-child {
    margin-bottom: 0;
}

/* CTA Link Styling */
.calc-cta-link {
    display: block;
    text-decoration: none;
    text-align: center;
    line-height: var(--calc-input-height);
}

/* Related Calculators Section */
.calc-related-section {
    padding: var(--calc-space-6) 0;
    border-top: 1px solid var(--calc-color-border);
    margin-top: var(--calc-space-6);
}

.calc-section-header {
    margin-bottom: var(--calc-space-4);
}

.calc-section-title {
    font-size: var(--calc-text-xl);
    font-weight: 600;
    color: var(--calc-color-text);
    margin-bottom: var(--calc-space-1);
}

.calc-section-description {
    font-size: var(--calc-text-sm);
    color: var(--calc-color-text-secondary);
}

.calc-calculator-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--calc-space-3);
}

.calc-calculator-card {
    display: block;
    background: var(--calc-color-background);
    border: 1px solid var(--calc-color-border);
    padding: var(--calc-space-3);
    text-decoration: none;
    color: var(--calc-color-text);
    transition: all 0.15s ease;
}

.calc-calculator-card:hover {
    border-color: var(--calc-color-primary);
}

.calc-calculator-card-title {
    font-size: var(--calc-text-base);
    font-weight: 600;
    margin-bottom: var(--calc-space-1);
}

.calc-calculator-card-desc {
    font-size: var(--calc-text-sm);
    color: var(--calc-color-text-secondary);
    line-height: 1.5;
}

/* FAQ Section */
.calc-faq-section {
    padding: var(--calc-space-6) 0;
    border-top: 1px solid var(--calc-color-border);
}

.calc-faq-list {
    max-width: 800px;
}

.calc-faq-item {
    border-bottom: 1px solid var(--calc-color-border);
}

.calc-faq-question {
    width: 100%;
    padding: var(--calc-space-3) 0;
    background: none;
    border: none;
    text-align: left;
    font-family: var(--calc-font-family);
    font-size: var(--calc-text-base);
    font-weight: 600;
    color: var(--calc-color-text);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.calc-faq-question:hover {
    color: var(--calc-color-primary);
}

.calc-faq-icon {
    font-size: var(--calc-text-xl);
    color: var(--calc-color-text-secondary);
    transition: transform 0.2s ease;
}

.calc-faq-item.open .calc-faq-icon {
    transform: rotate(45deg);
}

.calc-faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.calc-faq-item.open .calc-faq-answer {
    max-height: 500px;
}

.calc-faq-answer-content {
    padding-bottom: var(--calc-space-3);
    color: var(--calc-color-text-secondary);
    line-height: 1.6;
}

/* Modal Styles */
.calc-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.calc-modal.show {
    display: flex;
}

.calc-modal-content {
    background: var(--calc-color-background);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    border: 1px solid var(--calc-color-border);
}

.calc-modal-header {
    padding: var(--calc-space-4);
    border-bottom: 1px solid var(--calc-color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.calc-modal-title {
    font-size: var(--calc-text-xl);
    font-weight: 600;
}

.calc-modal-close {
    background: none;
    border: none;
    font-size: var(--calc-text-2xl);
    cursor: pointer;
    color: var(--calc-color-text-secondary);
    padding: 0;
    width: 32px;
    height: 32px;
}

.calc-modal-close:hover {
    color: var(--calc-color-text);
}

.calc-modal-body {
    padding: var(--calc-space-4);
}

.calc-modal-footer {
    padding: var(--calc-space-4);
    border-top: 1px solid var(--calc-color-border);
    display: flex;
    gap: var(--calc-space-2);
    justify-content: flex-end;
}

@media (max-width: 640px) {
    .calc-modal-footer {
        flex-direction: column;
        gap: var(--calc-space-3);
    }

    .calc-modal-footer button {
        width: 100%;
        flex: none;
    }
}

/* Print Styles */
.calc-print-section {
    margin-bottom: var(--calc-space-4);
}

.calc-print-header {
    text-align: center;
    margin-bottom: var(--calc-space-4);
    padding-bottom: var(--calc-space-4);
    border-bottom: 2px solid var(--calc-color-border);
}

.calc-print-title {
    font-size: var(--calc-text-2xl);
    font-weight: 600;
    margin-bottom: var(--calc-space-1);
}

.calc-print-date {
    font-size: var(--calc-text-sm);
    color: var(--calc-color-text-secondary);
}

.calc-print-result-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--calc-space-3);
    margin-bottom: var(--calc-space-4);
}

.calc-print-result-item {
    border: 1px solid var(--calc-color-border);
    padding: var(--calc-space-3);
}

/* Quote Form */
.calc-form-grid {
    display: grid;
    gap: var(--calc-space-3);
}

.calc-form-input {
    width: 100%;
    height: var(--calc-input-height);
    padding: 0 var(--calc-space-2);
    font-family: var(--calc-font-family);
    font-size: var(--calc-text-base);
    border: 2px solid var(--calc-color-border);
    outline: none;
}

.calc-form-input:focus {
    border-color: var(--calc-color-primary);
}

.calc-form-textarea {
    min-height: 120px;
    padding: var(--calc-space-2);
    resize: vertical;
}

/* Utility Classes */
.calc-hidden {
    display: none;
}

/* Print Section Headings */
.calc-print-section-heading {
    margin-bottom: 1rem;
    font-size: 1rem;
}

/* Print Bags Section */
.calc-print-bags-section {
    margin-top: var(--calc-space-4);
    margin-bottom: var(--calc-space-3);
}

.calc-print-bags-heading {
    font-size: var(--calc-text-sm);
    font-weight: 600;
    color: var(--calc-color-text);
    margin-bottom: var(--calc-space-2);
}

/* Print Note */
.calc-print-note {
    margin-top: var(--calc-space-4);
    padding: var(--calc-space-3);
    background: rgba(50, 150, 165, 0.05);
    border-left: 3px solid var(--calc-color-primary);
    border-radius: var(--calc-border-radius);
    font-size: var(--calc-text-xs);
    color: var(--calc-color-text-secondary);
}

.calc-print-note strong {
    color: var(--calc-color-text);
    display: block;
    margin-bottom: var(--calc-space-1);
}

.calc-print-note ul {
    margin: 0;
    padding-left: var(--calc-space-4);
}

.calc-print-note li {
    margin-bottom: var(--calc-space-1);
}

/* Print Result Value Large */
.calc-print-value-lg {
    font-size: 1.5rem;
}

/* Modal Footer Button Variants */
.calc-modal-btn-flex {
    flex: 1;
}

.calc-modal-btn-primary {
    background: var(--calc-color-accent);
    color: white;
    border-color: var(--calc-color-accent);
}

.calc-modal-btn-primary:hover {
    background: #26cfe9;
    border-color: #26cfe9;
}

/* Print Media Query */
@media print {

    .calc-header,
    .calc-modal-header,
    .calc-modal-footer,
    .calc-input-panel,
    .calc-result-actions,
    .calc-related-section,
    .calc-faq-section {
        display: none;
    }

    .calc-results-panel {
        position: static;
        border: none;
    }
}

/* ==========================================================================
   HEADER — RESPONSIVE
   ========================================================================== */

/* Tablet */
@media (max-width: 768px) {
    .calc-project-types {
        gap: 8px;
        padding: 12px 0;
    }

    .calc-project-type {
        min-width: 140px;
        height: 46px;
        font-size: 0.875rem;
        padding: 0 18px;
    }
}

/* Mobile */
@media (max-width: 640px) {
    .calc-breadcrumb {
        font-size: 0.75rem;
        flex-wrap: wrap;
    }

    .calc-page-title {
        font-size: var(--calc-text-xl);
        margin-bottom: 10px;
    }

    .calc-project-types {
        flex-direction: column;
        gap: 8px;
        padding: 12px 0;
    }

    .calc-project-type {
        width: 100%;
        min-width: auto;
        height: 48px;
        font-size: 0.9375rem;
        border-radius: 6px;
    }
}

/* Small Mobile (480px) */
@media (max-width: 480px) {
    .calc-page-title {
        font-size: 1.1rem;
        line-height: 1.3;
    }

    .calc-project-types {
        gap: 8px;
        padding: 10px 0;
    }

    .calc-project-type {
        height: 46px;
        font-size: 0.875rem;
        border-radius: 6px;
    }
}

/* Extra Small (375px) */
@media (max-width: 376px) {
    .calc-page-title {
        font-size: 1rem;
        line-height: 1.3;
    }

    .calc-project-types {
        gap: 6px;
        padding: 8px 0;
    }

    .calc-project-type {
        height: 44px;
        font-size: 0.8125rem;
        border-radius: 6px;
    }
}

/* ==========================================================================
   MOBILE OPTIMIZATIONS (640px and below)
   ========================================================================== */

@media (max-width: 640px) {

    /* Container padding */
    .calc-container {
        padding: 0 var(--calc-space-2);
    }

    /* Form sections spacing */
    .calc-form-section {
        margin-bottom: var(--calc-space-4);
    }

    .calc-form-section-title {
        font-size: 0.75rem;
        margin-bottom: var(--calc-space-2);
        padding-bottom: var(--calc-space-1);
    }

    /* Input groups - better touch targets */
    .calc-input-with-units {
        height: 52px;
        display: flex;
        flex-wrap: nowrap;
    }

    .calc-input-field {
        font-size: 16px !important;
        /* Prevents zoom on iOS */
        flex: 1;
        min-width: 0;
        /* Allow flex item to shrink below content size */
    }

    /* Unit selector - prevent wrapping and overflow */
    .calc-unit-selector {
        display: flex;
        flex-wrap: nowrap;
        flex-shrink: 0;
        /* Prevent unit selector from shrinking */
    }

    .calc-unit-btn {
        min-width: 42px;
        max-width: 50px;
        padding: 0 6px;
        font-size: 0.75rem;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    /* Results panel mobile spacing */
    .calc-results-panel {
        padding: var(--calc-space-3);
        margin-top: var(--calc-space-4);
    }

    .calc-results-empty {
        padding: var(--calc-space-4) var(--calc-space-2);
        font-size: 0.875rem;
    }

    .calc-empty-text {
        font-size: 0.875rem;
    }

    /* Primary result mobile sizing */
    .calc-result-primary {
        padding-bottom: var(--calc-space-3);
        margin-bottom: var(--calc-space-3);
    }

    .calc-result-value {
        font-size: var(--calc-text-2xl);
    }

    .calc-result-unit {
        font-size: var(--calc-text-sm);
    }

    /* Breakdown table mobile */
    .calc-breakdown-row {
        padding: var(--calc-space-1) 0;
        font-size: 0.813rem;
    }

    .calc-breakdown-title {
        font-size: 0.875rem;
        margin-bottom: var(--calc-space-1);
    }

    /* Action buttons full width */
    .calc-result-actions {
        padding-top: var(--calc-space-3);
    }

    .calc-action-btn {
        height: 52px;
        font-size: 0.875rem;
    }

    /* Related calculators mobile */
    .calc-related-section {
        padding: var(--calc-space-4) 0;
    }

    .calc-calculator-grid {
        grid-template-columns: 1fr;
        gap: var(--calc-space-2);
    }

    .calc-calculator-card {
        padding: var(--calc-space-3);
    }

    .calc-calculator-card-title {
        font-size: 0.938rem;
    }

    .calc-calculator-card-desc {
        font-size: 0.813rem;
    }

    /* FAQ section mobile */
    .calc-faq-section {
        padding: var(--calc-space-4) 0;
    }

    .calc-section-title {
        font-size: var(--calc-text-lg);
    }

    .calc-section-description {
        font-size: 0.813rem;
    }

    .calc-faq-question {
        padding: var(--calc-space-2) 0;
        font-size: 0.938rem;
    }

    .calc-faq-answer-content {
        padding-bottom: var(--calc-space-2);
        font-size: 0.875rem;
    }

    /* Modal mobile */
    .calc-modal-content {
        width: 95%;
        max-height: 85vh;
    }

    .calc-modal-header,
    .calc-modal-body,
    .calc-modal-footer {
        padding: var(--calc-space-3);
    }

    .calc-modal-title {
        font-size: var(--calc-text-lg);
    }

    /* Print section mobile */
    .calc-print-result-grid {
        grid-template-columns: 1fr;
        gap: var(--calc-space-2);
    }

    .calc-print-title {
        font-size: var(--calc-text-xl);
    }

    /* Form inputs mobile */
    .calc-form-input {
        font-size: 16px !important;
        height: 52px;
    }

    .calc-form-textarea {
        min-height: 100px;
        font-size: 16px !important;
    }

    /* Button group mobile */
    .calc-button-group {
        gap: var(--calc-space-2);
    }

    .calc-calculate-btn,
    .calc-clear-btn {
        font-size: 0.938rem;
    }
}

/* ==========================================
   SMALL DEVICES (480px and below)
   Covers: 320px – 480px screens
   ========================================== */
@media (max-width: 480px) {

    /* Prevent horizontal scroll */
    html,
    body {
        overflow-x: hidden;
        max-width: 100vw;
    }

    /* Container padding */
    .calc-container {
        padding: 0 16px;
        max-width: 100%;
        box-sizing: border-box;
    }

    /* Layout */
    .calc-layout {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 24px 0;
        max-width: 100%;
    }

    /* Input group constraints */
    .calc-input-group {
        max-width: 100%;
        overflow: hidden;
    }

    .calc-input-label {
        font-size: 0.813rem;
        gap: 8px;
        flex-wrap: wrap;
    }

    .calc-input-help {
        font-size: 0.688rem;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    /* Input + unit wrapper */
    .calc-input-with-units {
        height: 48px;
        width: 100%;
        max-width: 100%;
        display: flex;
        flex-wrap: nowrap;
        box-sizing: border-box;
    }

    /* Prevent iOS zoom */
    .calc-input-field,
    .calc-form-input,
    .calc-form-textarea {
        font-size: 16px !important;
        box-sizing: border-box;
    }

    .calc-input-field {
        flex: 1;
        min-width: 0;
        padding: 0 8px;
    }

    /* Unit selector */
    .calc-unit-selector {
        flex-shrink: 0;
        display: flex;
    }

    .calc-unit-btn {
        min-width: 32px;
        max-width: 38px;
        padding: 0 3px;
        font-size: 0.65rem;
        white-space: nowrap;
    }

    /* Form spacing */
    .calc-form-section {
        margin-bottom: 18px;
    }

    .calc-form-section-title {
        font-size: 0.75rem;
    }

    /* Buttons full width */
    .calc-button-group {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .calc-calculate-btn,
    .calc-clear-btn {
        height: 50px;
        font-size: 0.9rem;
    }

    /* Results panel */
    .calc-results-panel {
        position: static;
        padding: 16px;
        margin-top: 20px;
    }

    .calc-result-value {
        font-size: 1.5rem;
    }

    /* Related calculators stack */
    .calc-calculator-grid {
        grid-template-columns: 1fr;
    }

    /* Modal full width */
    .calc-modal-content {
        width: 95%;
        max-height: 85vh;
    }
}

/* ==========================================
   EXTRA SMALL DEVICES (375px and below)
   iPhone SE and similar
   ========================================== */
@media (max-width: 376px) {

    html,
    body {
        overflow-x: hidden;
    }

    .calc-container {
        padding: 0 8px;
    }

    .calc-layout {
        grid-template-columns: 1fr;
        gap: 16px;
        padding: 20px 0;
    }

    .calc-input-with-units {
        height: 46px;
        width: 100%;
        display: flex;
        flex-wrap: nowrap;

    }

    .calc-input-field,
    .calc-form-input,
    .calc-form-textarea {
        font-size: 14px !important;

    }

    .calc-input-field {
        flex: 1;
        min-width: 0;
        padding: 0 8px;
    }

    .calc-unit-selector {
        flex-shrink: 0;
        display: flex;
    }

    .calc-unit-btn {
        min-width: 32px;
        max-width: 40px;
        padding: 0 4px;
        font-size: 0.65rem;
        white-space: nowrap;
    }

    .calc-form-section {
        margin-bottom: 16px;
    }

    .calc-form-section-title {
        font-size: 0.75rem;
    }

    .calc-button-group {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .calc-calculate-btn,
    .calc-clear-btn {
        height: 46px;
        font-size: 0.85rem;
    }
    
    .calc-results-panel {
        position: static;
        padding: 12px;
        margin-top: 16px;
    }

    .calc-result-value {
        font-size: 1.25rem;
    }
    .calc-faq-question {
        padding: var(--calc-space-1) 0;
        font-size: 0.838rem;
    }
    .calc-faq-answer-content {
        padding-bottom: var(--calc-space-1);
        font-size: 0.775rem;
    }

    .calc-calculator-grid {
        grid-template-columns: 1fr;
    }

    .calc-modal-content {
        width: 95%;
        max-height: 85vh;
    }
}