/* Base Styles */
:root {
    --bg-dark: #111827;
    --bg-card: #1f2937;
    --border-color: #374151;
    --text-light: #ffffff;
    --text-dim: #d1d5db;
    --text-muted: #9ca3af;
    --blue-accent: #3b82f6;
    --blue-accent-dark: #2563eb;
    --green-accent: #10b981;
    --purple-accent: #8b5cf6;
    --orange-accent: #f97316;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
    line-height: 1.5;
    background-color: var(--bg-dark);
    color: var(--text-light);
}

/* Container */
.calculator-container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: var(--bg-card);
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* Header */
.calculator-header {
    background: linear-gradient(to right, #1e3a8a, #3730a3);
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.calculator-header h1 {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.calculator-icon {
    width: 2rem;
    height: 2rem;
    margin-right: 0.75rem;
    flex-shrink: 0;
}

.calculator-header p {
    font-size: 0.875rem;
    color: var(--text-dim);
}

/* Inputs Section */
.calculator-inputs {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.calculator-inputs h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.quote {
    font-style: italic;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

.input-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-dim);
    font-weight: 500;
}

.input-group select {
    width: 100%;
    padding: 0.5rem;
    background-color: #374151;
    border: 1px solid #4b5563;
    border-radius: 0.375rem;
    color: var(--text-light);
    font-size: 0.875rem;
}

.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.project-type-btn {
    padding: 0.5rem 1rem;
    background-color: #374151;
    border: none;
    border-radius: 0.375rem;
    color: var(--text-dim);
    font-size: 0.875rem;
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s;
}

.project-type-btn:hover {
    background-color: #4b5563;
}

.project-type-selected {
    background: linear-gradient(to right, #2563eb, #1d4ed8);
    color: white;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

/* Results Sections */
.results-section {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.section-title {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

/* Summary Cards */
.summary-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.summary-card {
    background-color: var(--bg-card);
    padding: 1rem;
    border-radius: 0.375rem;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
}

.summary-card.blue {
    border-left: 4px solid var(--blue-accent);
}

.summary-card.green {
    border-left: 4px solid var(--green-accent);
}

.summary-card.purple {
    border-left: 4px solid var(--purple-accent);
}

.summary-card.orange {
    border-left: 4px solid var(--orange-accent);
}

.summary-card h3 {
    color: var(--text-dim);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.summary-value {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.blue .summary-value {
    color: #60a5fa;
}

.green .summary-value {
    color: #34d399;
}

.purple .summary-value {
    color: #a78bfa;
}

.orange .summary-value {
    color: #fb923c;
}

.citation {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-style: italic;
    margin-top: 0.5rem;
}

/* Layer Sections */
.layer-section {
    background-color: var(--bg-card);
    border-radius: 0.375rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
}

.layer-title {
    display: flex;
    align-items: center;
    font-size: 1.125rem;
    color: #60a5fa;
    margin-bottom: 1rem;
}

.layer-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 1.75rem;
    height: 1.75rem;
    background-color: #1e40af;
    border-radius: 50%;
    margin-right: 0.5rem;
    color: white;
    font-size: 0.875rem;
}

.layer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

.layer-details p, 
.layer-costs p {
    margin-bottom: 0.5rem;
    color: var(--text-dim);
    font-size: 0.875rem;
}

.layer-details strong, 
.layer-costs strong {
    color: var(--text-light);
}

.layer-issues,
.layer-costs > div {
    margin-top: 1rem;
}

.layer-issues h4,
.layer-costs h4 {
    color: var(--text-light);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.layer-issues ul,
.layer-costs ul {
    list-style-type: disc;
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

.layer-issues li,
.layer-costs li {
    color: var(--text-dim);
    font-size: 0.75rem;
    margin-bottom: 0.25rem;
}

.layer-citation {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-style: italic;
    margin-top: 1rem;
}

/* Environmental Impact */
.env-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

.env-card {
    background-color: var(--bg-card);
    padding: 1rem;
    border-radius: 0.375rem;
    border-left: 4px solid var(--green-accent);
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
}

.env-card h3 {
    display: flex;
    align-items: center;
    color: #34d399;
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.env-icon {
    width: 1.25rem;
    height: 1.25rem;
    margin-right: 0.5rem;
}

.env-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: #34d399;
    margin-bottom: 0.75rem;
}

.env-card ul {
    list-style-type: disc;
    padding-left: 1.5rem;
}

.env-card li {
    color: var(--text-dim);
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
}

/* Disclaimer */
.disclaimer {
    padding: 1rem;
    background-color: var(--bg-dark);
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-muted);
    font-style: italic;
}

.disclaimer p {
    margin-bottom: 0.5rem;
}

/* Responsive Styles */
@media (min-width: 640px) {
    .calculator-header {
        padding: 2rem;
    }
    
    .calculator-header h1 {
        font-size: 1.875rem;
    }
    
    .calculator-header p {
        font-size: 1rem;
    }
    
    .calculator-inputs,
    .results-section {
        padding: 2rem;
    }
    
    .summary-grid,
    .env-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .layer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .summary-value,
    .env-value {
        font-size: 1.875rem;
    }
}

@media (min-width: 768px) {
    .input-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .calculator-header h1 {
        font-size: 2.25rem;
    }
    
    .summary-grid,
    .env-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .project-type-btn {
        padding: 0.75rem 1.25rem;
        font-size: 1rem;
    }
}