/* Reset e variáveis CSS */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --background-color: #ecf0f1;
    --danger-color: #e74c3c;
    --success-color: #2ecc71;
    --text-color: #2c3e50;
    --border-radius: 12px;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base styles */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    padding-bottom: 80px;
    min-height: 100vh;
}

/* Header */
.app-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-align: center;
    padding: 2rem 1rem;
    box-shadow: var(--shadow);
}

.app-header h1 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.app-header p {
    opacity: 0.9;
    font-size: 1rem;
}

/* Main content */
.app-main {
    max-width: 800px;
    margin: 0 auto;
    padding: 1rem;
}

/* Sections */
.section {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

.section.active {
    display: block;
}

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

/* Cards */
.welcome-card,
.results-container,
.simulation-container,
.comparison-container,
.faq-container {
    background: white;
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.welcome-card h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.welcome-card p {
    color: #666;
    margin-bottom: 2rem;
}

/* Input groups */
.input-group {
    position: relative;
    margin-bottom: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

.input-group input {
    width: 100%;
    padding: 1rem;
    border: 2px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    background: #fafafa;
}

.input-group input:focus {
    outline: none;
    border-color: var(--secondary-color);
    background: white;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.input-group .currency,
.input-group .unit {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: #666;
    font-weight: 600;
    margin-top: 1.25rem;
}

/* Buttons */
.primary-btn {
    width: 100%;
    padding: 1.2rem;
    background: linear-gradient(135deg, var(--secondary-color), #2980b9);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(52, 152, 219, 0.3);
}

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

.primary-btn i {
    margin-right: 0.5rem;
}

/* Result cards */
.result-card,
.sim-result-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    border-left: 4px solid var(--secondary-color);
}

.result-card.highlight {
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border-left-color: var(--success-color);
}

.result-card h3,
.sim-result-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

.big-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--success-color);
    margin: 0.5rem 0;
}

.result-card p,
.sim-result-card p {
    color: #666;
    font-size: 0.9rem;
}

/* Chart container */
.chart-container {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 2rem 0;
    box-shadow: var(--shadow);
}

.chart-container canvas {
    max-width: 100%;
    height: auto;
}

/* Milestones */
.milestones-container {
    margin-top: 2rem;
}

.milestones-container h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.milestones-list {
    display: grid;
    gap: 1rem;
}

.milestone-item {
    background: linear-gradient(135deg, #fff, #f8f9fa);
    border-radius: var(--border-radius);
    padding: 1rem;
    border-left: 4px solid var(--secondary-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.milestone-item.achieved {
    border-left-color: var(--success-color);
    background: linear-gradient(135deg, #d4edda, #c3e6cb);
}

.milestone-item h4 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.milestone-item p {
    color: #666;
    font-size: 0.9rem;
}

/* Simulation controls */
.simulation-controls {
    background: #f8f9fa;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

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

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

.comparison-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border-top: 4px solid var(--secondary-color);
}

.comparison-card.inss {
    border-top-color: #f39c12;
}

.comparison-card.private {
    border-top-color: var(--success-color);
}

.comparison-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.pros-cons {
    margin-bottom: 1.5rem;
}

.pros, .cons {
    margin-bottom: 1rem;
}

.pros h4 {
    color: var(--success-color);
    margin-bottom: 0.5rem;
}

.cons h4 {
    color: var(--danger-color);
    margin-bottom: 0.5rem;
}

.pros ul, .cons ul {
    list-style: none;
    padding-left: 0;
}

.pros li, .cons li {
    padding: 0.25rem 0;
    font-size: 0.9rem;
}

.comparison-value {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
}

.recommendation-card {
    background: linear-gradient(135deg, #e8f5e8, #d4edda);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    border-left: 4px solid var(--success-color);
}

.recommendation-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

/* FAQ Styles */
.faq-item {
    border-bottom: 1px solid #eee;
    margin-bottom: 1rem;
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    padding: 1.5rem 0;
    text-align: left;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--primary-color);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

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

.faq-icon {
    font-size: 1.2rem;
    transition: var(--transition);
}

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

.faq-answer {
    padding-bottom: 1.5rem;
    color: #666;
    line-height: 1.6;
    animation: slideDown 0.3s ease-out;
}

.faq-answer[hidden] {
    display: none;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Bottom Navigation */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    display: flex;
    justify-content: space-around;
    padding: 0.5rem 0;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.5rem;
    text-decoration: none;
    color: #666;
    transition: var(--transition);
    border-radius: 8px;
    min-width: 60px;
}

.nav-item i {
    font-size: 1.2rem;
    margin-bottom: 0.25rem;
}

.nav-item span {
    font-size: 0.7rem;
    font-weight: 500;
}

.nav-item.active {
    color: var(--secondary-color);
    background: rgba(52, 152, 219, 0.1);
}

.nav-item:hover {
    color: var(--secondary-color);
    background: rgba(52, 152, 219, 0.05);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 1rem;
    color: #666;
    font-size: 0.9rem;
    background: white;
    margin-top: 2rem;
}

/* Loading states */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid var(--secondary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Error states */
.error {
    background: #fee;
    border-color: var(--danger-color);
    color: var(--danger-color);
}

.error-message {
    background: var(--danger-color);
    color: white;
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    display: none;
}

.error-message.show {
    display: block;
    animation: slideIn 0.3s ease-out;
}

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

/* Success states */
.success-message {
    background: var(--success-color);
    color: white;
    padding: 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    display: none;
}

.success-message.show {
    display: block;
    animation: slideIn 0.3s ease-out;
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-header {
        padding: 1.5rem 1rem;
    }
    
    .app-header h1 {
        font-size: 1.5rem;
    }
    
    .app-main {
        padding: 0.5rem;
    }
    
    .welcome-card,
    .results-container,
    .simulation-container,
    .comparison-container,
    .faq-container {
        padding: 1.5rem;
        margin-bottom: 1rem;
    }
    
    .big-number {
        font-size: 1.8rem;
    }
    
    .comparison-cards {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .simulation-results {
        grid-template-columns: 1fr;
    }
    
    .nav-item span {
        font-size: 0.65rem;
    }
    
    .nav-item i {
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    .input-group input {
        padding: 0.8rem;
    }
    
    .primary-btn {
        padding: 1rem;
        font-size: 1rem;
    }
    
    .result-card,
    .sim-result-card {
        padding: 1rem;
    }
    
    .big-number {
        font-size: 1.5rem;
    }
    
    .chart-container {
        padding: 1rem;
    }
    
    .faq-question {
        font-size: 1rem;
        padding: 1rem 0;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    }
    
    .input-group input {
        border-width: 3px;
    }
    
    .result-card,
    .sim-result-card {
        border-left-width: 6px;
    }
}

/* 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 {
    .bottom-nav,
    .app-header,
    footer {
        display: none;
    }
    
    .app-main {
        max-width: none;
        padding: 0;
    }
    
    .section {
        display: block !important;
        page-break-after: always;
    }
    
    .section:last-child {
        page-break-after: avoid;
    }
}