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

:root {
    --deep-green: #1B5E20;
    --medium-green: #388E3C;
    --light-green: #66BB6A;
    --gold: #FFB300;
    --light-gold: #FDD835;
    --white: #FFFFFF;
    --light-gray: #F5F5F5;
    --medium-gray: #E0E0E0;
    --dark-gray: #424242;
    --red: #C62828;
    --amber: #FF8F00;
}

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

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background: linear-gradient(135deg, var(--deep-green) 0%, var(--medium-green) 100%);
    color: var(--white);
    padding: 30px 0;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 10px;
}

.header-logo {
    width: 80px;
    height: 80px;
    object-fit: contain;
    background: white;
    border-radius: 10px;
    padding: 5px;
}

.header-text {
    text-align: left;
}

.subhead {
    font-size: 1.1rem;
    margin-bottom: 15px;
    opacity: 0.95;
}

.feature-tags {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    font-size: 0.9rem;
    margin-top: 15px;
}

.feature-tags span {
    opacity: 0.9;
}

.cta-bar {
    background: var(--white);
    padding: 15px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
    position: sticky;
    top: 0;
    z-index: 100;
}

.btn-primary {
    background: var(--gold);
    color: var(--dark-gray);
    padding: 12px 28px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.btn-primary:hover {
    background: var(--light-gold);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
    background: var(--white);
    color: var(--deep-green);
    padding: 12px 28px;
    border-radius: 6px;
    font-weight: 600;
    border: 2px solid var(--deep-green);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.btn-secondary:hover {
    background: var(--deep-green);
    color: var(--white);
}

.btn-calculate {
    background: var(--deep-green);
    color: var(--white);
    padding: 15px 40px;
    border-radius: 8px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    width: 100%;
    margin-top: 20px;
    transition: all 0.3s ease;
}

.btn-calculate:hover {
    background: var(--medium-green);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}

.btn-link {
    background: none;
    border: none;
    color: var(--deep-green);
    cursor: pointer;
    text-decoration: underline;
    font-size: 0.9rem;
    margin-top: 10px;
    width: 100%;
}

.btn-link:hover {
    color: var(--medium-green);
}

.main-content {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 30px;
    margin: 30px auto;
    align-items: start;
}

.inputs-panel {
    background: var(--white);
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 80px;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
}

.panel-header {
    margin-bottom: 25px;
}

.panel-header h2 {
    color: var(--deep-green);
    margin-bottom: 15px;
}

.scenario-select {
    width: 100%;
    padding: 10px;
    border: 2px solid var(--medium-gray);
    border-radius: 6px;
    font-size: 1rem;
    background: var(--white);
}

.input-section {
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--medium-gray);
}

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

.input-section h3 {
    color: var(--deep-green);
    font-size: 1.1rem;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

.input-group {
    margin-bottom: 15px;
}

.input-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: var(--dark-gray);
    font-size: 0.9rem;
}

.input-group input[type="number"] {
    width: 100%;
    padding: 10px;
    border: 2px solid var(--medium-gray);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.input-group input[type="number"]:focus {
    outline: none;
    border-color: var(--deep-green);
}

.checkbox-group label {
    display: flex;
    align-items: center;
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    margin-right: 8px;
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.tooltip {
    display: inline-block;
    width: 18px;
    height: 18px;
    background: var(--gold);
    color: var(--white);
    border-radius: 50%;
    text-align: center;
    line-height: 18px;
    font-size: 0.8rem;
    margin-left: 5px;
    cursor: help;
    font-weight: bold;
}

.results-panel {
    background: var(--white);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.results-panel h2 {
    color: var(--deep-green);
    margin-bottom: 25px;
    font-size: 1.8rem;
}

.warnings-box,
.tips-box {
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.warnings-box {
    background: #FFF3E0;
    border-left: 4px solid var(--amber);
}

.tips-box {
    background: #E8F5E9;
    border-left: 4px solid var(--medium-green);
}

.warnings-box ul,
.tips-box ul {
    margin-top: 10px;
    margin-left: 20px;
}

.kpi-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.kpi-card {
    background: linear-gradient(135deg, var(--light-gray) 0%, var(--white) 100%);
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
    border: 2px solid var(--medium-gray);
    transition: all 0.3s ease;
}

.kpi-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.kpi-card.positive {
    border-color: var(--medium-green);
    background: linear-gradient(135deg, #E8F5E9 0%, var(--white) 100%);
}

.kpi-card.neutral {
    border-color: var(--amber);
    background: linear-gradient(135deg, #FFF3E0 0%, var(--white) 100%);
}

.kpi-card.negative {
    border-color: var(--red);
    background: linear-gradient(135deg, #FFEBEE 0%, var(--white) 100%);
}

.kpi-card.roi-card {
    background: linear-gradient(135deg, var(--deep-green) 0%, var(--medium-green) 100%);
    color: var(--white);
    border: none;
}

.kpi-label {
    font-size: 0.9rem;
    margin-bottom: 10px;
    opacity: 0.8;
}

.roi-card .kpi-label {
    color: var(--white);
    opacity: 0.95;
}

.kpi-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--deep-green);
}

.roi-card .kpi-value {
    color: var(--white);
    font-size: 2.5rem;
}

.roi-badge {
    display: inline-block;
}

.detail-tables {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.detail-table {
    background: var(--light-gray);
    padding: 20px;
    border-radius: 8px;
}

.detail-table h3 {
    color: var(--deep-green);
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.detail-table table {
    width: 100%;
    border-collapse: collapse;
}

.detail-table tr {
    border-bottom: 1px solid var(--medium-gray);
}

.detail-table tr:last-child {
    border-bottom: none;
}

.detail-table td {
    padding: 10px 0;
}

.detail-table td:last-child {
    text-align: right;
    font-weight: 600;
    color: var(--deep-green);
}

.charts-section {
    margin-top: 40px;
}

.chart-container {
    background: var(--white);
    padding: 25px;
    border-radius: 10px;
    margin-bottom: 30px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

.chart-container h3 {
    color: var(--deep-green);
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.sensitivity-charts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.sensitivity-chart {
    background: var(--white);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

.sensitivity-chart h4 {
    color: var(--deep-green);
    margin-bottom: 15px;
    font-size: 1rem;
}

footer {
    background: var(--dark-gray);
    color: var(--white);
    padding: 30px 0;
    margin-top: 50px;
    text-align: center;
}

footer p {
    max-width: 900px;
    margin: 0 auto;
    line-height: 1.8;
    opacity: 0.9;
}

@media (max-width: 1024px) {
    .main-content {
        grid-template-columns: 1fr;
    }
    
    .inputs-panel {
        position: static;
        max-height: none;
    }
    
    .kpi-cards {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.5rem;
    }
    
    .subhead {
        font-size: 1rem;
    }
    
    .feature-tags {
        font-size: 0.8rem;
    }
    
    .cta-bar {
        flex-direction: column;
    }
    
    .detail-tables {
        grid-template-columns: 1fr;
    }
    
    .sensitivity-charts {
        grid-template-columns: 1fr;
    }
    
    .kpi-value {
        font-size: 1.5rem;
    }
    
    .roi-card .kpi-value {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    header {
        padding: 20px 0;
    }
    
    .inputs-panel,
    .results-panel {
        padding: 20px;
    }
    
    .kpi-cards {
        grid-template-columns: 1fr;
    }
}