/* Student Loan Interest Calculator - Education Theme Styles */

:root {
    /* Primary Colors - Education Theme */
    --primary-color: #4F46E5; /* Indigo - Education/Academic */
    --secondary-color: #06D6A0; /* Teal - Growth/Success */
    --dark-color: #3730A3; /* Dark Indigo */
    --light-color: #EEF2FF; /* Light Indigo */
    
    /* Supporting Colors */
    --accent-color: #7C3AED; /* Purple - Academic Achievement */
    --success-color: #10B981; /* Green - Success */
    --warning-color: #F59E0B; /* Amber - Caution */
    --error-color: #EF4444; /* Red - Error */
    --info-color: #3B82F6; /* Blue - Information */
    
    /* Text Colors */
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-muted: #9CA3AF;
    --text-white: #FFFFFF;
    
    /* Background Colors */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    --bg-dark: #1F2937;
    
    /* Border and Shadow */
    --border-color: #E5E7EB;
    --border-light: #F3F4F6;
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-heavy: 0 10px 25px rgba(0, 0, 0, 0.15);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #4F46E5 0%, #06D6A0 100%);
    --gradient-secondary: linear-gradient(135deg, #7C3AED 0%, #4F46E5 100%);
    --gradient-success: linear-gradient(135deg, #10B981 0%, #06D6A0 100%);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Main Content */
.main-content {
    padding: var(--spacing-2xl) 0;
    min-height: calc(100vh - 200px);
}

/* Calculator Header */
.calculator-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    padding: var(--spacing-2xl) 0;
    background: var(--gradient-primary);
    color: var(--text-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-medium);
}

.calculator-header h1 {
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.calculator-header .subtitle {
    font-size: 1.125rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.5;
}

/* Calculator Container */
.calculator-container {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-medium);
    overflow: hidden;
    margin-bottom: var(--spacing-2xl);
}

.calculator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    min-height: 600px;
}

/* Input Section */
.input-section {
    padding: var(--spacing-2xl);
    background: var(--bg-primary);
    border-right: 1px solid var(--border-color);
}

.input-section h2 {
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
    color: var(--primary-color);
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.input-section h2::before {
    content: "🎓";
    font-size: 1.25rem;
}

/* Form Styles */
.form-group {
    margin-bottom: var(--spacing-xl);
}

.input-label {
    display: block;
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-size: 0.95rem;
}

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

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

.input-prefix {
    position: absolute;
    left: var(--spacing-md);
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
    z-index: 1;
    pointer-events: none;
}

.input-field {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    transition: all 0.3s ease;
    color: var(--text-primary);
}

.input-field:has(+ .input-prefix),
.input-field:focus:has(+ .input-prefix) {
    padding-left: 2.5rem;
}

input[type="number"].input-field {
    padding-left: 2.5rem;
}

.input-field:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
    background-color: var(--bg-primary);
}

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

.input-field:invalid:focus {
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

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

/* Calculate Button */
.calculate-button {
    width: 100%;
    background: var(--gradient-primary);
    color: var(--text-white);
    border: none;
    padding: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-light);
    margin-top: var(--spacing-lg);
}

.calculate-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    background: var(--gradient-secondary);
}

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

/* Results Section */
.results-section {
    padding: var(--spacing-2xl);
    background: linear-gradient(135deg, var(--light-color) 0%, #F0F9FF 100%);
    display: flex;
    flex-direction: column;
}

.results-section h2 {
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
    color: var(--primary-color);
    margin-bottom: var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.results-section h2::before {
    content: "📊";
    font-size: 1.25rem;
}

.results-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* Placeholder Content */
.placeholder-content {
    text-align: center;
    color: var(--text-secondary);
    padding: var(--spacing-2xl) var(--spacing-lg);
}

.placeholder-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.6;
}

.placeholder-content h3 {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.placeholder-content p {
    line-height: 1.5;
    max-width: 300px;
    margin: 0 auto;
}

/* Results Display */
.results-display {
    display: none;
}

.results-display.show {
    display: block;
    animation: fadeInUp 0.5s ease;
}

.result-card {
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-light);
}

.result-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.result-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--text-white);
}

.result-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

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

.result-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.4;
}

/* Eligibility Status */
.eligibility-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-lg);
}

.eligibility-status.eligible {
    background: rgba(16, 185, 129, 0.1);
    color: #065F46;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.eligibility-status.not-eligible {
    background: rgba(239, 68, 68, 0.1);
    color: #991B1B;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.eligibility-status.partial {
    background: rgba(245, 158, 11, 0.1);
    color: #92400E;
    border: 1px solid rgba(245, 158, 11, 0.2);
}

/* Information Sections */
.info-sections {
    margin-bottom: var(--spacing-2xl);
}

.info-section {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-light);
}

.info-section h2 {
    font-size: 1.75rem;
    font-weight: var(--font-weight-semibold);
    color: var(--primary-color);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.info-card {
    text-align: center;
    padding: var(--spacing-xl);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    transition: all 0.3s ease;
}

.info-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
    background: var(--bg-primary);
}

.info-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
    display: block;
}

.info-card h3 {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.info-card p {
    color: var(--text-secondary);
    line-height: 1.5;
    font-size: 0.95rem;
}

/* Data Table */
.limits-table {
    margin-top: var(--spacing-lg);
}

.table-responsive {
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.data-table th {
    background: var(--light-color);
    color: var(--primary-color);
    font-weight: var(--font-weight-semibold);
    padding: var(--spacing-lg);
    text-align: left;
    border-bottom: 2px solid var(--border-color);
}

.data-table td {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-light);
    color: var(--text-primary);
}

.data-table tbody tr:hover {
    background: var(--bg-secondary);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

/* Requirements Grid */
.requirements-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-lg);
}

.requirement-card {
    padding: var(--spacing-xl);
    border-radius: var(--radius-md);
    border: 2px solid;
}

.requirement-card.eligible {
    background: rgba(16, 185, 129, 0.05);
    border-color: rgba(16, 185, 129, 0.2);
}

.requirement-card.not-eligible {
    background: rgba(239, 68, 68, 0.05);
    border-color: rgba(239, 68, 68, 0.2);
}

.requirement-card h3 {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-lg);
}

.requirement-card.eligible h3 {
    color: #065F46;
}

.requirement-card.not-eligible h3 {
    color: #991B1B;
}

.requirement-card ul {
    list-style: none;
    padding: 0;
}

.requirement-card li {
    padding: var(--spacing-sm) 0;
    line-height: 1.4;
    font-size: 0.95rem;
}

.requirement-card.eligible li {
    color: #047857;
}

.requirement-card.not-eligible li {
    color: #B91C1C;
}

/* Related Calculators */
.related-calculators {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-light);
}

.related-calculators h2 {
    font-size: 1.75rem;
    font-weight: var(--font-weight-semibold);
    color: var(--primary-color);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

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

.related-calc-card {
    display: block;
    text-decoration: none;
    padding: var(--spacing-xl);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    transition: all 0.3s ease;
    text-align: center;
}

.related-calc-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
    background: var(--bg-primary);
    text-decoration: none;
}

.calc-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
    display: block;
}

.related-calc-card h3 {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.related-calc-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.4;
}

/* FAQ Section */
.faq-section {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-light);
    border: 1px solid var(--border-light);
}

.faq-section h2 {
    font-size: 1.75rem;
    font-weight: var(--font-weight-semibold);
    color: var(--primary-color);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    background: var(--bg-secondary);
}

.faq-question {
    width: 100%;
    padding: var(--spacing-lg);
    background: none;
    border: none;
    text-align: left;
    font-size: 1rem;
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
    background: var(--bg-primary);
}

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

.faq-question[aria-expanded="true"] {
    background: var(--light-color);
    color: var(--primary-color);
}

.faq-icon {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    transition: transform 0.3s ease;
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
    background: var(--bg-primary);
}

.faq-answer.show {
    padding: var(--spacing-lg);
    max-height: 200px;
}

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

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

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-heavy);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    animation: slideUp 0.3s ease;
}

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

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
}

.modal-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-xl);
}

.modal-footer {
    padding: var(--spacing-xl);
    border-top: 1px solid var(--border-light);
    text-align: center;
}

.modal-button {
    background: var(--gradient-primary);
    color: var(--text-white);
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all 0.3s ease;
}

.modal-button:hover {
    background: var(--gradient-secondary);
    transform: translateY(-1px);
}

.validation-message {
    background: rgba(239, 68, 68, 0.1);
    color: #991B1B;
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    border: 1px solid rgba(239, 68, 68, 0.2);
    font-size: 0.9rem;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }
    
    .input-section {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    
    .requirements-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .main-content {
        padding: var(--spacing-lg) 0;
    }
    
    .calculator-header {
        padding: var(--spacing-xl) var(--spacing-lg);
        margin-bottom: var(--spacing-xl);
    }
    
    .calculator-header h1 {
        font-size: 2rem;
    }
    
    .calculator-header .subtitle {
        font-size: 1rem;
    }
    
    .input-section,
    .results-section {
        padding: var(--spacing-xl);
    }
    
    .info-section,
    .related-calculators,
    .faq-section {
        padding: var(--spacing-xl);
    }
    
    .info-grid,
    .calculator-grid-3 {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .data-table {
        font-size: 0.875rem;
    }
    
    .data-table th,
    .data-table td {
        padding: var(--spacing-md);
    }
    
    .modal-content {
        width: 95%;
        margin: var(--spacing-lg);
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: var(--spacing-lg);
    }
}

@media (max-width: 480px) {
    .calculator-header h1 {
        font-size: 1.75rem;
    }
    
    .result-value {
        font-size: 1.5rem;
    }
    
    .info-section h2,
    .related-calculators h2,
    .faq-section h2 {
        font-size: 1.5rem;
    }
    
    .faq-question {
        font-size: 0.95rem;
        padding: var(--spacing-md);
    }
    
    .faq-answer.show {
        padding: var(--spacing-md);
    }
}

/* Print Styles */
@media print {
    .calculate-button,
    .related-calculators,
    .faq-section,
    .modal {
        display: none !important;
    }
    
    .calculator-grid {
        grid-template-columns: 1fr;
    }
    
    .results-section {
        background: white !important;
    }
    
    .calculator-container,
    .info-section {
        box-shadow: none !important;
        border: 1px solid #ccc !important;
    }
    
    .main-content {
        padding: 0;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
        --bg-secondary: #ffffff;
    }
    
    .input-field:focus {
        border-color: #000000;
        box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.3);
    }
}

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