:root {
    --yellow: #f7dc3a;
    --dark-bg: #1a1d23;
    --card-bg: #252930;
    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --border-color: #3a3f4b;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--dark-bg);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 40px 20px;
}

.container {
    max-width: 700px;
    margin: 0 auto;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 40px;
}

.logo {
    width: 90px;
    height: 90px;
    margin: 0 auto 20px;
}

.logo img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 12px;
}

.title {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* Formulário */
.calculator-section {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    margin-bottom: 32px;
}

.input-group {
    margin-bottom: 24px;
}

.input-group:last-of-type {
    margin-bottom: 0;
}

.input-label {
    display: block;
    font-size: 0.9375rem;
    font-weight: 500;
    margin-bottom: 8px;
}

.input-field {
    width: 100%;
    padding: 14px 16px;
    background: var(--dark-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
    transition: border-color 0.2s;
}

.input-field:focus {
    outline: none;
    border-color: var(--yellow);
}

.calculate-btn {
    width: 100%;
    padding: 16px;
    background: var(--yellow);
    border: 2px solid var(--yellow);
    color: var(--dark-bg);
    font-size: 1.125rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    margin-top: 24px;
    transition: all 0.2s;
}

.calculate-btn:hover {
    background: var(--dark-bg);
    color: var(--yellow);
}

/* Loading */
.loading-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(26, 29, 35, 0.95);
    z-index: 9999;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.loading-overlay.active {
    display: flex;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--yellow);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-text {
    margin-top: 20px;
    font-size: 1.125rem;
    font-weight: 500;
}

/* Resultados */
.results-section {
    animation: fadeIn 0.4s ease;
}

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

.formal-summary {
    background: var(--card-bg);
    border: 2px solid var(--yellow);
    border-radius: 12px;
    padding: 28px;
    margin-bottom: 32px;
    line-height: 1.8;
}

.summary-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--yellow);
    margin-bottom: 16px;
}

.summary-content {
    font-size: 1rem;
    color: var(--text-secondary);
    text-align: justify;
}

.summary-content strong {
    color: var(--yellow);
    font-weight: 600;
}

/* Métricas */
.metrics-simple {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 32px;
}

.metric-box {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    text-align: center;
}

.metric-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--yellow);
    margin-bottom: 8px;
}

.metric-name {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Gráfico */
.chart-box {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 28px;
    margin-bottom: 32px;
}

.chart-header {
    margin-bottom: 24px;
}

.chart-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.chart-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

#savingsChart {
    max-height: 320px;
}

/* Benefícios */
.benefits-box {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 32px;
    margin-bottom: 32px;
}

.benefits-box h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 24px;
    text-align: center;
}

.benefits-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.benefit {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--dark-bg);
    border-radius: 8px;
    font-size: 0.9375rem;
    color: var(--text-primary);
}

.benefit-icon {
    flex-shrink: 0;
}

/* CTAs */
.cta-box {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.btn-cta {
    padding: 16px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 50px;
    text-decoration: none;
    text-align: center;
    transition: all 0.2s;
    background: var(--yellow);
    color: var(--dark-bg);
    border: 2px solid var(--yellow);
}

.btn-cta:hover {
    background: var(--dark-bg);
    color: var(--yellow);
}

.btn-recalculate {
    width: 100%;
    padding: 14px;
    background: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-recalculate:hover {
    border-color: var(--yellow);
    color: var(--yellow);
}

/* Footer */
.footer {
    text-align: center;
    padding: 32px 0;
    margin-top: 48px;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.footer-link a {
    color: var(--yellow);
    text-decoration: none;
}

/* Responsivo */
@media (max-width: 768px) {
    .metrics-simple {
        grid-template-columns: 1fr;
    }
    
    .cta-box {
        grid-template-columns: 1fr;
    }
    
    .metric-number {
        font-size: 1.75rem;
    }
    
    .logo {
        width: 80px;
        height: 80px;
    }
    
    .formal-summary {
        padding: 24px;
    }
    
    .summary-content {
        text-align: left;
    }
}

@media (max-width: 480px) {
    body {
        padding: 20px 12px;
    }
    
    .title {
        font-size: 1.75rem;
    }
    
    .calculator-section,
    .chart-box,
    .benefits-box {
        padding: 24px;
    }
    
    .formal-summary {
        padding: 20px;
    }
    
    .summary-title {
        font-size: 1rem;
    }
    
    .summary-content {
        font-size: 0.9375rem;
        text-align: left;
    }
    
    .metric-number {
        font-size: 1.5rem;
    }
    
    .chart-title {
        font-size: 1.125rem;
    }
    
    .chart-subtitle {
        font-size: 0.8125rem;
    }
    
    .benefit {
        font-size: 0.875rem;
    }
    
    .logo {
        width: 70px;
        height: 70px;
    }
}