.calc-container {
    margin: 0 auto;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}
.input-group {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.input-group label {
    min-width: 30px;
    text-align: right;
    color: #495057;
}
.input-group select {
    padding: 8px 12px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    background-color: #fff;
    flex-grow: 1;
    min-width: 60px;
}
textarea#result {
    width: 100%;
    box-sizing: border-box;
    padding: 10px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    background-color: #e9ecef;
    font-family: monospace;
    resize: vertical;
}
textarea#result.error {
    color: #dc3545;
    border-color: #dc3545;
}
button#calculateButton {
    display: block;
    width: 100%;
    padding: 12px 20px;
    font-size: 1.1em;
    color: #fff;
    background-color: #007bff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin-bottom: 20px;
    box-sizing: border-box;
}
button#calculateButton:hover {
    background-color: #0056b3;
}
.result-container {
    background-color: #fff;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}
.result-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 15px;
    flex-wrap: wrap;
    gap: 10px;
}
.result-header h3 {
    margin: 0;
    color: #0056b3;
    font-size: 1.3em;
    flex-shrink: 0;
}
.header-buttons {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}
.header-buttons button {
    width: auto;
    height: 32px;
    padding: 5px 10px;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s ease;
    position: relative;
    flex-shrink: 0;
    gap: 5px;
}
.header-buttons button svg {
    width: 18px;
    height: 18px;
    fill: white;
}
.header-buttons button span:not(.copy-tooltip) {
    font-size: 0.9em;
    line-height: 1;
    white-space: nowrap;
}
button#copyBtn {
    background-color: #6c757d;
}
button#copyBtn:hover {
    background-color: #5a6268;
}
button#copyBtn .copy-tooltip {
    visibility: hidden;
    width: 80px;
    background-color: #555;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 5px 0;
    position: absolute;
    z-index: 1;
    bottom: 110%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 0.3s, visibility 0.3s, background-color 0.3s;
    font-size: 0.8em;
    white-space: nowrap;
    pointer-events: none;
}
button#copyBtn.copied .copy-tooltip {
    visibility: visible;
    opacity: 1;
    background-color: #28a745;
}
button#copyBtn.copied[data-copy-state="error"] .copy-tooltip {
    background-color: #dc3545;
}
button#resetBtn {
    background-color: #dc3545;
}
button#resetBtn:hover {
    background-color: #c82333;
}
@media (max-width: 600px) {
    .input-group {
        flex-direction: column;
        align-items: stretch;
        gap: 15px;
    }
     .input-group label {
         width: auto;
         margin-right: 0;
         text-align: left;
         margin-bottom: 5px;
     }
     .input-group select {
        flex-grow: 1;
        width: 100%;
     }
    .result-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
}
.chart-container {
    margin-top: 20px;
    padding: 15px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    height: 400px;
    position: relative;
}