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

:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-border: #e5e7eb;
    --color-bg: #ffffff;
    --color-bg-light: #f9fafb;
    --color-bg-dark: #f3f4f6;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

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

/* ====================================
   Header
   ==================================== */
.header {
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
    text-align: center;
}

.logo {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.tagline {
    color: var(--color-text-light);
    font-size: 1.125rem;
}

/* ====================================
   Main Content
   ==================================== */
.main {
    padding: var(--spacing-xl) 0;
}

.intro {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.intro h2 {
    font-size: 1.875rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.intro p {
    font-size: 1.125rem;
    color: var(--color-text-light);
    max-width: 700px;
    margin: 0 auto;
}

/* ====================================
   Form Styling
   ==================================== */
.form {
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
}

.form-section {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.form-section:last-of-type {
    border-bottom: none;
}

.form-section h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.section-description {
    color: var(--color-text-light);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

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

.form-group label {
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text);
    font-size: 0.875rem;
}

.form-group input,
.form-group select {
    padding: 0.625rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group small {
    margin-top: var(--spacing-xs);
    color: var(--color-text-light);
    font-size: 0.75rem;
}

.currency-hint,
.unit-hint {
    font-weight: 500;
    color: var(--color-primary);
}

.range-slider {
    margin-top: var(--spacing-xs);
    width: 100%;
    height: 6px;
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

.range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
}

.range-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    border: none;
}

/* ====================================
   Buttons
   ==================================== */
.form-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    padding-top: var(--spacing-md);
}

.btn {
    padding: 0.75rem 2rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: var(--color-bg-dark);
    color: var(--color-text);
}

.btn-secondary:hover {
    background-color: var(--color-border);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* ====================================
   Results Section
   ==================================== */
.results {
    background-color: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    animation: fadeIn 0.5s ease-in;
}

.results.hidden {
    display: none;
}

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

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.results-header h2 {
    font-size: 1.75rem;
    color: var(--color-text);
}

.results-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* ====================================
   Score Card
   ==================================== */
.score-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

.score-main {
    text-align: center;
}

.score-value {
    font-size: 4rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: var(--spacing-xs);
}

.score-label {
    font-size: 1rem;
    opacity: 0.9;
}

.score-recommendation {
    flex: 1;
}

.recommendation-badge {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    font-weight: 700;
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    backdrop-filter: blur(10px);
}

.recommendation-badge.strong-buy {
    background-color: var(--color-success);
}

.recommendation-badge.good-buy {
    background-color: var(--color-success);
}

.recommendation-badge.fair {
    background-color: var(--color-warning);
}

.recommendation-badge.risky {
    background-color: var(--color-warning);
}

.recommendation-badge.dont-buy {
    background-color: var(--color-danger);
}

#recommendationText {
    font-size: 1rem;
    opacity: 0.95;
    line-height: 1.5;
}

/* ====================================
   Breakdown Section
   ==================================== */
.breakdown {
    margin-top: var(--spacing-lg);
}

.breakdown h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.metric-card {
    background-color: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.metric-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border);
}

.metric-header h4 {
    font-size: 1.125rem;
    color: var(--color-text);
}

.metric-score {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
}

.metric-details {
    margin-top: var(--spacing-md);
}

.detail-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-xs) 0;
    font-size: 0.875rem;
}

.detail-row span {
    color: var(--color-text-light);
}

.detail-row strong {
    color: var(--color-text);
    font-weight: 600;
}

.metric-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background-color: var(--color-bg);
    border-left: 3px solid var(--color-primary);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--color-text);
}

/* ====================================
   Cost Breakdown
   ==================================== */
.cost-breakdown {
    background-color: var(--color-bg-light);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.cost-breakdown h4 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.cost-table {
    background-color: var(--color-bg);
    border-radius: var(--radius-sm);
    padding: var(--spacing-sm);
}

.cost-row {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.875rem;
}

.cost-row span {
    color: var(--color-text-light);
}

.cost-row strong {
    color: var(--color-text);
    font-weight: 600;
}

.cost-total {
    border-top: 2px solid var(--color-border);
    margin-top: var(--spacing-xs);
    padding-top: var(--spacing-sm);
    font-size: 1rem;
    font-weight: 600;
}

.cost-total span,
.cost-total strong {
    color: var(--color-text);
    font-weight: 700;
}

/* ====================================
   Results Footer
   ==================================== */
.results-footer {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

/* ====================================
   Footer
   ==================================== */
.footer {
    background-color: var(--color-bg);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.disclaimer {
    background-color: #fff3cd;
    border: 1px solid #ffc107;
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.disclaimer h4 {
    color: #856404;
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
}

.disclaimer p {
    color: #856404;
    font-size: 0.875rem;
    line-height: 1.6;
}

.copyright {
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.875rem;
}

/* ====================================
   Responsive Design
   ==================================== */
@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .score-card {
        flex-direction: column;
        text-align: center;
    }
    
    .results-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .logo {
        font-size: 1.5rem;
    }
    
    .intro h2 {
        font-size: 1.5rem;
    }
    
    .score-value {
        font-size: 3rem;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
    }
    
    .container {
        padding: 0 var(--spacing-xs);
    }
    
    .form {
        padding: var(--spacing-md);
    }
    
    .results {
        padding: var(--spacing-md);
    }
    
    .score-card {
        padding: var(--spacing-md);
    }
    
    .score-value {
        font-size: 2.5rem;
    }
}

/* ====================================
   Print Styles
   ==================================== */
@media print {
    body {
        background-color: white;
    }
    
    .header,
    .footer,
    .form,
    .intro,
    .results-actions,
    .results-footer {
        display: none;
    }
    
    .results {
        box-shadow: none;
        border: 1px solid #000;
    }
    
    .score-card {
        background: #f0f0f0;
        color: #000;
    }
}