body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background: #fafbfc;
    margin: 0;
    padding: 0;
}
.container {
    max-width: 700px;
    margin: 40px auto;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 2px 16px rgba(0,0,0,0.07);
    padding: 32px 24px;
}
h1 {
    color: #3a3d4d;
    margin-bottom: 24px;
}
.calculator-card {
    border-radius: 12px;
    background: #fff;
    padding: 24px;
    box-shadow: 0 1px 8px rgba(0,0,0,0.04);
}
.tabs {
    display: flex;
    margin-bottom: 24px;
}
.tab {
    padding: 8px 28px;
    border: none;
    background: none;
    font-size: 1.1em;
    color: #6c6f7a;
    border-radius: 20px;
    margin-right: 12px;
    cursor: pointer;
    transition: background 0.2s;
}
.tab.active {
    background: #e6fcf5;
    color: #1abc9c;
    font-weight: bold;
}
.inputs-section {
    display: flex;
    flex-direction: column;
    gap: 18px;
    margin-bottom: 24px;
}
.input-group label {
    font-size: 1em;
    color: #3a3d4d;
    margin-bottom: 4px;
    display: block;
}
.input-row {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 4px;
}
.input-row .currency,
.input-row .percent,
.input-row .years {
    color: #1abc9c;
    font-weight: bold;
    font-size: 1.1em;
}
input[type="number"] {
    width: 90px;
    padding: 4px 8px;
    border: 1px solid #e0e0e0;
    border-radius: 4px;
    font-size: 1em;
    outline: none;
}
input[type="range"] {
    width: 100%;
    margin-top: 2px;
    accent-color: #1abc9c;
}
.results-section {
    display: flex;
    gap: 32px;
    align-items: flex-start;
}
.chart-container {
    width: 200px;
    text-align: center;
}
.legend {
    margin-top: 10px;
    font-size: 0.95em;
    color: #6c6f7a;
    display: flex;
    justify-content: center;
    gap: 16px;
    align-items: center;
}
.legend-color {
    display: inline-block;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    margin-right: 5px;
}
.legend-color.invested {
    background: #e6eaff;
}
.legend-color.returns {
    background: #3d5afe;
}
.summary {
    flex: 1;
    min-width: 220px;
}
.summary-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 1.08em;
    color: #3a3d4d;
}
.summary-row.total {
    font-weight: bold;
    font-size: 1.13em;
    margin-top: 12px;
}
.invest-btn {
    margin-top: 18px;
    background: #1abc9c;
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 10px 28px;
    font-size: 1.1em;
    cursor: pointer;
    font-weight: bold;
    transition: background 0.2s;
}
.invest-btn:hover {
    background: #159c82;
}
@media (max-width: 700px) {
    .container { padding: 12px 2px; }
    .results-section { flex-direction: column; gap: 18px; }
    .chart-container { margin: 0 auto; }
}