@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap');

:root {
    --bg-color: #f8f9fa;
    --card-bg-color: #ffffff;
    --text-color: #212529;
    --primary-color: #007bff;
    --border-color: #dee2e6;
    --shadow-color: rgba(0, 0, 0, 0.05);
    --success-color: #28a745;
    --danger-color: #dc3545;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 2rem;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

header {
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

header h1 {
    margin-bottom: 0.5rem;
}

header p {
    font-size: 1.1rem;
    color: #6c757d;
    margin-top: 0;
}

main {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 2rem;
    align-items: start;
}

.controls-container {
    background-color: var(--card-bg-color);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px var(--shadow-color);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.control-group h2 {
    font-size: 1.2rem;
    margin-top: 0;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.control-group label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out;
}

.control-group label:hover {
    background-color: #f1f3f5;
}

.control-group input[type="radio"],
.control-group input[type="checkbox"] {
    accent-color: var(--primary-color);
    width: 1.15em;
    height: 1.15em;
}

.plan-details {
    font-size: 0.8rem;
    color: #6c757d;
    margin-left: 2.1rem;
    margin-top: -0.25rem;
    margin-bottom: 0.5rem;
}

.output-container {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.kpi-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.kpi-card {
    background-color: var(--card-bg-color);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px var(--shadow-color);
    border: 1px solid var(--border-color);
    text-align: center;
}

.kpi-card h3 {
    margin-top: 0;
    margin-bottom: 0.5rem;
    font-size: 1rem;
    color: #495057;
}

.kpi-card p {
    margin: 0;
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.kpi-card.net-profit p {
    color: var(--success-color);
}

.kpi-card small {
    font-size: 0.8rem;
    color: #6c757d;
}

.chart-container {
    background-color: var(--card-bg-color);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px var(--shadow-color);
    border: 1px solid var(--border-color);
    min-height: 320px;
}

.notes-container {
    background-color: #fffbe6;
    border: 1px solid #ffe58f;
    color: #8a6d3b;
    padding: 1rem;
    border-radius: 8px;
}

.notes-container p {
    margin: 0;
}

.hidden {
    display: none;
}

#load-data-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out;
    margin-top: 1rem;
}

#load-data-btn:hover {
    background-color: #0056b3;
}

.instructions {
    font-size: 0.9rem;
    color: #6c757d;
    margin-bottom: 1rem;
}

.csv-format {
    font-size: 0.8rem;
    color: #6c757d;
    display: block;
    margin-top: -0.75rem;
    margin-bottom: 0.5rem;
}

input[type="file"] {
    width: 100%;
}

.features-container, .data-table-container, .calculation-container {
    background-color: var(--card-bg-color);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px var(--shadow-color);
    border: 1px solid var(--border-color);
    margin-top: 1rem;
}

.features-container h3, .data-table-container h3 {
    margin-top: 0;
}

.table-wrapper {
    max-height: 400px;
    overflow-y: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

th, td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

thead th {
    background-color: #f8f9fa;
    position: sticky;
    top: 0;
}

tbody tr:nth-child(even) {
    background-color: #f8f9fa;
}

.features-table .check {
    color: var(--success-color);
    text-align: center;
    font-weight: bold;
}

.features-table .cross {
    color: var(--danger-color);
    text-align: center;
}

details {
    cursor: pointer;
}

details summary {
    font-weight: 600;
}

#calculation-log {
    margin-top: 1rem;
    padding: 1rem;
    background-color: #f1f3f5;
    border-radius: 6px;
    font-family: 'Courier New', Courier, monospace;
    white-space: pre-wrap;
    max-height: 400px;
    overflow-y: auto;
    font-size: 0.85rem;
}

#date-slider {
    margin: 1.5rem 0.5rem;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: #6c757d;
}

#churn-slider {
    margin: 1.5rem 0.5rem;
}

#churn-rate-label {
    font-weight: bold;
    color: var(--primary-color);
}

@media (max-width: 1200px) {
    main {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    body {
        padding: 1rem;
    }
    .kpi-container {
        grid-template-columns: 1fr 1fr;
    }
}