/* Business Mileage Calculator CSS */
/* Apple-style Design System for Professional Tax Calculator */

:root {
    --primary-color: #204080;
    --secondary-color: #5AC8FA;
    --dark-color: #0056CC;
    --light-color: #E3F2FD;
    --text-dark: #1a202c;
    --text-light: #4a5568;
    --text-muted: #718096;
    --border-color: #e2e8f0;
    --success-color: #48bb78;
    --warning-color: #ed8936;
    --error-color: #e53e3e;
    --gradient-primary: linear-gradient(135deg, #204080 0%, #5AC8FA 100%);
    --gradient-secondary: linear-gradient(135deg, #5AC8FA 0%, #204080 100%);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: #ffffff;
    font-size: 16px;
}

/* Container and Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header Styles */
.header {
    background: var(--gradient-primary);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: white;
}

.logo a {
    display: flex;
    align-items: center;
    color: white;
    text-decoration: none;
}

.logo-img {
    height: 32px;
    margin-right: 0.75rem;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    white-space: nowrap;
}

.nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

/* Breadcrumb */
.breadcrumb {
    background: #f8fafc;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
}

.breadcrumb a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

/* Main Content */
.main-content {
    padding: 2rem 0;
}

/* Page Header */
.page-header {
    text-align: center;
    margin-bottom: 3rem;
}

.page-header h1 {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.page-description {
    font-size: 1.25rem;
    color: var(--text-light);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Calculator Container */
.calculator-container {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    padding: 2rem;
    margin-bottom: 3rem;
    border: 1px solid var(--border-color);
}

.calculator-wrapper {
    max-width: 1000px;
    margin: 0 auto;
}

/* Method Selection */
.method-selection {
    margin-bottom: 2rem;
    text-align: center;
}

.method-selection h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.method-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.method-btn {
    background: white;
    border: 2px solid var(--border-color);
    color: var(--text-dark);
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
    min-width: 180px;
}

.method-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.method-btn.active {
    background: var(--gradient-primary);
    border-color: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-lg);
}

/* Calculation Sections */
.calculation-section {
    display: none;
    margin-bottom: 2rem;
}

.calculation-section.active {
    display: block;
}

.calculation-section h3 {
    font-size: 1.25rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-weight: 600;
    text-align: center;
}

/* Input Grid */
.input-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.input-group {
    display: flex;
    flex-direction: column;
}

.input-label {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.input-label.required::after {
    content: " *";
    color: var(--error-color);
    font-weight: 700;
}

.input-field {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: white;
    color: var(--text-dark);
}

.input-field:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(32, 64, 128, 0.1);
}

.input-field:invalid {
    border-color: var(--error-color);
}

.input-field.error {
    border-color: var(--error-color);
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

.help-text {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    line-height: 1.4;
}

/* Calculator Actions */
.calculator-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.calculate-btn {
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: 1rem 3rem;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    min-width: 200px;
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.calculate-btn:active {
    transform: translateY(0);
}

.reset-btn {
    background: white;
    color: var(--text-dark);
    border: 2px solid var(--border-color);
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    min-width: 150px;
}

.reset-btn:hover {
    border-color: var(--text-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

/* Results Section */
.results-container {
    background: linear-gradient(135deg, #f8fafc 0%, #e3f2fd 100%);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    margin-top: 2rem;
    border: 1px solid var(--light-color);
}

.results-container h3 {
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 2rem;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.result-item {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    text-align: center;
    border: 1px solid var(--border-color);
}

.result-label {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.result-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.result-description {
    font-size: 0.875rem;
    color: var(--text-light);
    line-height: 1.4;
}

.results-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.print-btn, .save-btn {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.print-btn:hover, .save-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

/* Content Section */
.content-section {
    margin-top: 4rem;
}

.content-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.content-main h2 {
    font-size: 2rem;
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.content-main h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 600;
    margin: 2rem 0 1rem 0;
}

.content-main p {
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

/* Rate Table */
.rate-table {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 1.5rem 0;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.rate-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.rate-item:last-child {
    border-bottom: none;
}

.rate-type {
    font-weight: 600;
    color: var(--text-dark);
}

.rate-amount {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Comparison Table */
.comparison-table {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin: 2rem 0;
}

.comparison-row {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.comparison-header h4 {
    color: var(--primary-color);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.comparison-content ul {
    list-style: none;
    padding-left: 0;
}

.comparison-content li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-light);
    line-height: 1.5;
}

.comparison-content li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

/* Documentation List */
.documentation-list {
    list-style: none;
    padding-left: 0;
}

.documentation-list li {
    position: relative;
    padding-left: 2rem;
    margin-bottom: 1rem;
    color: var(--text-light);
    line-height: 1.6;
}

.documentation-list li::before {
    content: "📋";
    position: absolute;
    left: 0;
    font-size: 1.25rem;
}

/* Scenarios Grid */
.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.scenario-card {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: var(--transition);
}

.scenario-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.scenario-card h4 {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.scenario-card p {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.5;
    margin: 0;
}

/* Sidebar */
.content-sidebar {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.related-calculators, .tax-tips {
    background: white;
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.related-calculators h3, .tax-tips h3 {
    color: var(--primary-color);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.calculator-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.calculator-link {
    display: block;
    padding: 1rem;
    background: #f8fafc;
    border-radius: var(--border-radius);
    text-decoration: none;
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.calculator-link:hover {
    background: var(--light-color);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.link-title {
    display: block;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.link-desc {
    display: block;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.tip-item {
    margin-bottom: 1.5rem;
}

.tip-item:last-child {
    margin-bottom: 0;
}

.tip-item h4 {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.tip-item p {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.5;
    margin: 0;
}

/* FAQ Section */
.faq-section {
    margin-top: 4rem;
}

.faq-section h2 {
    font-size: 2rem;
    color: var(--primary-color);
    font-weight: 700;
    text-align: center;
    margin-bottom: 2rem;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.faq-item {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.faq-item h3 {
    color: var(--primary-color);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.faq-item p {
    color: var(--text-light);
    line-height: 1.6;
    margin: 0;
}

/* Footer */
.footer {
    background: #1a202c;
    color: #e2e8f0;
    padding: 3rem 0 2rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    color: white;
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: #cbd5e0;
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--secondary-color);
}

.footer-bottom {
    border-top: 1px solid #2d3748;
    padding-top: 2rem;
    text-align: center;
    color: #a0aec0;
}

.disclaimer-text {
    font-size: 0.9rem;
    line-height: 1.5;
    margin: 0;
}

/* Validation Modal */
.validation-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h4 {
    color: var(--error-color);
    font-weight: 600;
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
}

.modal-close:hover {
    background: #f1f5f9;
    color: var(--text-dark);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
    text-align: right;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary:hover {
    background: var(--dark-color);
    transform: translateY(-1px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 0.75rem;
    }
    
    .nav {
        display: none;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
    
    .page-description {
        font-size: 1.1rem;
    }
    
    .calculator-container {
        padding: 1.5rem;
    }
    
    .method-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .method-btn {
        width: 100%;
        max-width: 300px;
    }
    
    .input-grid {
        grid-template-columns: 1fr;
    }
    
    .calculator-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .calculate-btn, .reset-btn {
        width: 100%;
        max-width: 300px;
    }
    
    .content-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .comparison-table {
        grid-template-columns: 1fr;
    }
    
    .scenarios-grid {
        grid-template-columns: 1fr;
    }
    
    .results-grid {
        grid-template-columns: 1fr;
    }
    
    .results-actions {
        flex-direction: column;
        align-items: center;
        gap: 0.75rem;
    }
    
    .print-btn, .save-btn {
        width: 100%;
        max-width: 250px;
    }
    
    .faq-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .page-header h1 {
        font-size: 1.75rem;
    }
    
    .calculator-container {
        padding: 1rem;
    }
    
    .result-value {
        font-size: 1.5rem;
    }
    
    .modal-content {
        width: 95%;
    }
}

/* Print Styles */
@media print {
    .header, .footer, .calculator-actions, .results-actions {
        display: none;
    }
    
    .calculator-container {
        box-shadow: none;
        border: 1px solid #ccc;
    }
    
    .results-container {
        background: white;
        border: 1px solid #ccc;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-light: #000000;
        --text-muted: #333333;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}