:root {
    --primary-color: #007bff;
    --primary-hover: #0056b3;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    
    --bg-color: #f8f9fa;
    --text-color: #212529;
    --card-bg: #ffffff;
    --border-color: #dee2e6;
    --shadow: rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    margin-bottom: 2rem;
    box-shadow: 0 2px 4px var(--shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

h1 {
    color: var(--primary-color);
    font-size: 1.75rem;
    font-weight: 700;
}

.website-name {
    font-size: 0.9rem;
    color: var(--secondary-color);
    margin-top: -10px;
    text-align: center;
}

.lang-selector select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 14px;
}

/* Description */
.description {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 2rem;
    border-left: 4px solid var(--primary-color);
    box-shadow: 0 2px 8px var(--shadow);
}

/* Inputs Section */
.inputs-section h2, .results-section h2 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.scenarios-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.scenario-card {
    background-color: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 4px 12px var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
    overflow: hidden;
}

.scenario-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--shadow);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    background-color: var(--primary-color);
    color: white;
    padding: 12px 15px;
}

.card-header input[type="checkbox"] {
    width: 20px;
    height: 20px;
    accent-color: var(--warning-color);
}

.scenario-title {
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
}

.card-body {
    padding: 20px;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

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

.form-group label {
    font-size: 0.875rem;
    margin-bottom: 5px;
    color: var(--secondary-color);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 0.9rem;
}

.form-group input:disabled {
    background-color: #e9ecef;
    cursor: not-allowed;
}

.loan-amount-display {
    background-color: var(--bg-color);
    padding: 10px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.loan-amount-display span {
    font-weight: bold;
    color: var(--primary-color);
    font-size: 1.1rem;
}

.rate-type-switch {
    display: flex;
    border-radius: 6px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.rate-type-switch input[type="radio"] {
    display: none;
}

.rate-type-label {
    flex: 1;
    text-align: center;
    padding: 10px;
    cursor: pointer;
    background-color: var(--bg-color);
    color: var(--secondary-color);
    transition: background-color 0.3s, color 0.3s;
    font-weight: 500;
}

.rate-type-switch input[type="radio"]:checked + .rate-type-label.fixed {
    background-color: var(--primary-color);
    color: white;
}

.rate-type-switch input[type="radio"]:checked + .rate-type-label.variable {
    background-color: var(--warning-color);
    color: var(--text-color);
}

.variable-rate-group.hidden {
    display: none;
}

#calculate {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 6px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
    margin-top: 2rem;
    width: 100%;
    max-width: 300px;
    margin-left: auto;
    margin-right: auto;
}

#calculate:hover {
    background-color: var(--primary-hover);
}

/* Results Section */
.results-section {
    display: block; /* Changed to show initially */
    margin-top: 3rem;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.result-card {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px var(--shadow);
    border-left: 4px solid var(--success-color);
}

.result-header {
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
}

.result-header h4 {
    color: var(--success-color);
    margin: 0;
    font-size: 1.2rem;
}

.result-body {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.result-section {
    background-color: #f8f9fa;
    padding: 1rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

.result-section h5 {
    color: var(--primary-color);
    margin: 0 0 0.75rem 0;
    font-size: 1rem;
    font-weight: 600;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.25rem;
}

.result-item {
    display: flex;
    justify-content: space-between;
    padding: 6px 0;
    border-bottom: 1px solid #e9ecef;
}

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

.result-item.highlight {
    background-color: #fff3cd;
    padding: 8px 10px;
    margin: 4px -10px;
    border-radius: 4px;
    border: 1px solid #ffeaa7;
}

.result-item.highlight span {
    font-weight: 700;
}

.result-value {
    font-weight: 600;
    color: var(--primary-color);
}

/* Chart Area */
.chart-area {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px var(--shadow);
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1rem;
}

.chart-header h3 {
    font-size: 1.25rem;
    color: var(--text-color);
}

.radio-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.radio-item {
    display: flex;
    align-items: center;
    gap: 5px;
}

.chart-container {
    height: 400px;
}

/* Related Sites Section */
.related-sites-section {
    margin-bottom: 2rem;
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.related-sites-section h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.related-sites-description {
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    text-align: center;
    font-size: 0.9rem;
}

.sites-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.category {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
}

.category h4 {
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.sites-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sites-list li {
    margin-bottom: 0.5rem;
}

.sites-list a {
    color: var(--primary-color);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

.sites-list a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

.current-site {
    color: var(--success-color);
    font-weight: 500;
    font-size: 0.9rem;
}

/* Footer */
footer {
    border-top: 1px solid var(--border-color);
    margin-top: 3rem;
    padding: 2rem 0;
    font-size: 0.9rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.legal-section summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--primary-color);
}

.legal-section .details-content {
    padding: 1rem;
    border-left: 2px solid var(--border-color);
    margin-top: 0.5rem;
}

.contact-section {
    margin-top: 1.5rem;
}

.copyright {
    text-align: center;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

/* Responsive */
@media (max-width: 768px) {
    .form-grid {
        grid-template-columns: 1fr;
    }

    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
}

/* Advice Section */
.advice-section {
    margin-top: 3rem;
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 8px var(--shadow);
}

.advice-section h2 {
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}

.advice-input-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.advice-section .form-group {
    max-width: 350px;
}

.input-help {
    font-size: 0.85rem;
    color: var(--secondary-color);
    margin-top: 0.25rem;
    font-style: italic;
}

.advice-btn {
    background: linear-gradient(135deg, #28a745, #20c997);
    color: white;
    border: none;
    padding: 14px 28px;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    max-width: 250px;
    box-shadow: 0 4px 12px rgba(40, 167, 69, 0.3);
    position: relative;
    overflow: hidden;
}

.advice-btn:hover {
    background: linear-gradient(135deg, #218838, #1e7e34);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(40, 167, 69, 0.4);
}

.advice-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(40, 167, 69, 0.3);
}

.advice-btn.loading {
    background: linear-gradient(135deg, #6c757d, #495057);
    cursor: not-allowed;
    transform: none;
}

.advice-btn .btn-icon {
    font-size: 1.2rem;
    animation: float 2s ease-in-out infinite;
}

.advice-btn.loading .btn-icon {
    animation: spin 1s linear infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-2px); }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.advice-output {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    min-height: 100px;
    white-space: pre-wrap;
    font-size: 0.95rem;
    line-height: 1.8;
}

.advice-output.loading {
    text-align: center;
    color: var(--secondary-color);
}

.advice-output.loading::after {
    content: ' ...';
    animation: loading-dots 1s infinite;
}

@keyframes loading-dots {
    0%, 80%, 100% { content: ' '; }
    20% { content: ' . '; }
    40% { content: ' . . '; }
    60% { content: ' . . . '; }
}

@media (max-width: 768px) {
    .advice-section .form-group {
        max-width: 100%;
    }
    
    .advice-btn {
        max-width: 100%;
        justify-content: center;
    }
    
    .sites-categories {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .category {
        padding: 0.75rem;
    }
}