/* Enhanced CSS for SEO 100/100 and Mobile-First Design - EMI Calculator India */

/* CSS Variables for Indian-Friendly Colors */
:root {
    --primary-blue: #007bff;
    --primary-blue-light: #0099ff;
    --primary-blue-dark: #0056b3;
    --success-green: #28a745;
    --success-green-light: #34ce57;
    --warning-orange: #fd7e14;
    --error-red: #dc3545;
    --saffron: #ff9933;
    --white: #ffffff;
    --gray-50: #f8f9fa;
    --gray-100: #e9ecef;
    --gray-200: #dee2e6;
    --gray-300: #ced4da;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    --light-blue-bg: #e6f3ff;
    --light-blue-bg2: #f0f8ff;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --transition: all 0.3s ease;
}

/* Base Styles - Mobile First */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
    line-height: 1.6;
    color: var(--gray-900);
    background: linear-gradient(135deg, var(--light-blue-bg) 0%, var(--light-blue-bg2) 100%);
    min-height: 100vh;
    font-size: clamp(16px, 2.5vw, 18px);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 0.5rem;
    color: var(--primary-blue);
}

h1 {
    font-size: clamp(1.8rem, 5vw, 2.5rem);
    font-weight: 700;
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    color: var(--primary-blue);
}

h3 {
    font-size: clamp(1.2rem, 3vw, 1.5rem);
    color: var(--gray-700);
}

p {
    margin-bottom: 1rem;
    font-size: clamp(1rem, 2.5vw, 1.1rem);
    line-height: 1.7;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
    color: var(--white);
    padding: 2.5rem 1rem;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

header h1 {
    margin-bottom: 1rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    color: var(--white);
}

header p {
    font-size: clamp(1rem, 3vw, 1.2rem);
    opacity: 0.95;
    max-width: 900px;
    margin: 0 auto;
    line-height: 1.6;
}

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

/* Cards */
.card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
    overflow: hidden;
    transition: var(--transition);
}

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

.card-header {
    background: var(--light-blue-bg);
    padding: 2rem 1.5rem;
    border-bottom: 2px solid var(--primary-blue-light);
}

.card-header h2 {
    text-align: center;
    margin: 0;
    color: var(--primary-blue);
}

.card-body {
    padding: 2rem;
}

/* Form Styles */
.form-group {
    margin-bottom: 2.5rem;
}

.form-label {
    display: block;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 1rem;
}

.label-text {
    font-size: clamp(1.1rem, 2.5vw, 1.2rem);
    display: block;
    margin-bottom: 0.75rem;
    color: var(--primary-blue);
}

.input-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Range Inputs - Enhanced for Mobile */
.range-input {
    width: 100%;
    height: 10px;
    background: var(--gray-200);
    border-radius: var(--border-radius);
    outline: none;
    transition: var(--transition);
    -webkit-appearance: none;
    cursor: pointer;
}

.range-input::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 2px solid var(--white);
}

.range-input::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: var(--shadow-md);
}

.range-input::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid var(--white);
    box-shadow: var(--shadow-sm);
}

.range-input:focus {
    background: var(--gray-300);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}

/* Number Inputs - Touch Friendly */
.number-input {
    padding: 1rem 1.25rem;
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    font-size: clamp(1rem, 2.5vw, 1.1rem);
    font-weight: 500;
    transition: var(--transition);
    background: var(--white);
    min-height: 52px; /* Touch-friendly */
    color: var(--gray-800);
}

.number-input:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.1);
}

.number-input.full-width {
    width: 100%;
}

/* Buttons - Enhanced for Mobile */
.button-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 2.5rem;
}

.btn {
    padding: 1.25rem 2rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: clamp(1.1rem, 2.5vw, 1.2rem);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-height: 52px; /* Touch-friendly */
    text-decoration: none;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-blue-dark) 0%, var(--primary-blue) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--white);
    color: var(--gray-700);
    border: 2px solid var(--gray-200);
}

.btn-secondary:hover {
    background: var(--gray-50);
    border-color: var(--primary-blue);
    color: var(--primary-blue);
    transform: translateY(-1px);
}

.btn-share {
    background: linear-gradient(135deg, var(--success-green) 0%, var(--success-green-light) 100%);
    color: var(--white);
}

.btn-share:hover {
    background: linear-gradient(135deg, var(--success-green-light) 0%, var(--success-green) 100%);
    transform: translateY(-2px);
}

/* Results Section */
.result-section {
    margin-top: 2.5rem;
    padding: 2.5rem;
    background: linear-gradient(135deg, var(--light-blue-bg) 0%, var(--white) 100%);
    border-radius: var(--border-radius-lg);
    border: 2px solid var(--primary-blue-light);
    box-shadow: var(--shadow-md);
}

.result-summary {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin-bottom: 2.5rem;
}

.result-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

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

.result-card h3 {
    color: var(--gray-600);
    font-size: clamp(0.9rem, 2vw, 1rem);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
}

.result-value {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 700;
    color: var(--primary-blue);
    line-height: 1.2;
}

/* Chart Section */
.chart-section {
    margin-bottom: 2.5rem;
    text-align: center;
}

.chart-section h3 {
    color: var(--primary-blue);
    margin-bottom: 2rem;
    font-size: clamp(1.3rem, 3vw, 1.6rem);
}

.chart-container {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 400px;
}

#pieChart {
    max-width: 100%;
    height: auto;
}

/* Table Section */
.table-section h3 {
    color: var(--primary-blue);
    margin-bottom: 1.5rem;
    text-align: center;
    font-size: clamp(1.3rem, 3vw, 1.6rem);
}

.table-container {
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    overflow-x: auto;
}

.amort-table {
    width: 100%;
    border-collapse: collapse;
    font-size: clamp(0.9rem, 2vw, 1rem);
}

.amort-table th {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-light) 100%);
    color: var(--white);
    padding: 1.25rem 1rem;
    text-align: center;
    font-weight: 600;
    font-size: clamp(0.85rem, 2vw, 0.95rem);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.amort-table td {
    padding: 1.25rem 1rem;
    text-align: center;
    border-bottom: 1px solid var(--gray-200);
    font-weight: 500;
}

.amort-table tbody tr:nth-child(even) {
    background: var(--gray-50);
}

.amort-table tbody tr:hover {
    background: rgba(0, 123, 255, 0.05);
    transform: scale(1.01);
    transition: var(--transition);
}

/* Content Boxes */
.formula-box, .example-box, .tip-box {
    padding: 2rem;
    border-radius: var(--border-radius);
    margin: 2rem 0;
    box-shadow: var(--shadow-sm);
}

.formula-box {
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-50) 100%);
    border-left: 4px solid var(--primary-blue);
}

.example-box {
    background: linear-gradient(135deg, #e6fffa 0%, #b2f5ea 100%);
    border-left: 4px solid var(--success-green);
}

.tip-box {
    background: linear-gradient(135deg, #fff8e1 0%, #ffecb3 100%);
    border-left: 4px solid var(--warning-orange);
}

.factor-list {
    list-style: none;
    padding: 0;
}

.factor-list li {
    padding: 1rem 0;
    border-bottom: 1px solid var(--gray-200);
    position: relative;
    padding-left: 2rem;
    font-size: clamp(1rem, 2.5vw, 1.1rem);
}

.factor-list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-green);
    font-weight: bold;
    font-size: 1.2em;
}

.factor-list li:last-child {
    border-bottom: none;
}

/* FAQ Styles */
.faq-list {
    display: grid;
    gap: 1.5rem;
}

.faq-item {
    border: 2px solid var(--gray-200);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--primary-blue-light);
    box-shadow: var(--shadow-sm);
}

.faq-item summary {
    padding: 1.75rem;
    cursor: pointer;
    font-weight: 600;
    font-size: clamp(1.1rem, 2.5vw, 1.2rem);
    color: var(--primary-blue);
    background: var(--gray-50);
    transition: var(--transition);
    list-style: none;
    min-height: 52px; /* Touch-friendly */
    display: flex;
    align-items: center;
}

.faq-item summary:hover {
    background: rgba(0, 123, 255, 0.05);
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    margin-left: auto;
    font-size: 1.8rem;
    font-weight: 400;
    transition: var(--transition);
}

.faq-item[open] summary::after {
    transform: rotate(45deg);
}

.faq-item p {
    padding: 2rem;
    margin: 0;
    background: var(--white);
    border-top: 1px solid var(--gray-200);
    line-height: 1.7;
    font-size: clamp(1rem, 2.5vw, 1.1rem);
}

/* Footer */
.footer {
    background: var(--gray-900);
    color: var(--white);
    padding: 3rem 0;
    margin-top: 4rem;
}

.disclaimer {
    margin-bottom: 1.5rem;
    opacity: 0.9;
    font-size: clamp(0.9rem, 2vw, 1rem);
    line-height: 1.6;
    text-align: center;
}

.footer-links {
    margin: 2rem 0;
    text-align: center;
}

.footer-links a {
    color: var(--warning-orange);
    text-decoration: none;
    transition: var(--transition);
    margin: 0 1rem;
    font-size: clamp(1rem, 2.5vw, 1.1rem);
}

.footer-links a:hover {
    color: var(--white);
    text-decoration: underline;
}

.copyright {
    text-align: center;
    font-size: clamp(0.8rem, 2vw, 0.9rem);
    opacity: 0.7;
    margin-top: 1.5rem;
    line-height: 1.5;
}

/* Responsive Design - Tablet */
@media (min-width: 600px) {
    .container {
        padding: 2rem;
    }
    
    .input-container {
        flex-direction: row;
        align-items: center;
        gap: 1.5rem;
    }
    
    .range-input {
        flex: 2;
    }
    
    .number-input {
        flex: 1;
        max-width: 180px;
    }
    
    .button-group {
        flex-direction: row;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .result-summary {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .chart-container {
        min-height: 500px;
    }
    
    .footer-links a {
        margin: 0 1.5rem;
    }
}

/* Responsive Design - Desktop */
@media (min-width: 1024px) {
    .card-body {
        padding: 3rem;
    }
    
    .result-section {
        padding: 3rem;
    }
    
    .chart-container {
        min-height: 600px;
    }
    
    #pieChart {
        max-width: 500px;
        max-height: 500px;
    }
    
    .faq-item summary {
        padding: 2rem;
    }
    
    .faq-item p {
        padding: 2.5rem;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    :root {
        --gray-200: #000000;
        --gray-600: #000000;
    }
    
    .range-input::-webkit-slider-thumb {
        border: 3px solid #000000;
    }
}

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

/* Print Styles */
@media print {
    header, footer, .btn, .faq-item summary::after {
        display: none;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #000;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .chart-container {
        min-height: 300px;
    }
}