:root {
  --calc-bg: #fff;
  --calc-text: #212529;
  --calc-title: #212529;
  --calc-label: #555;
  --calc-input-bg: #fff;
  --calc-input-border: #e0e0e0;
  --calc-input-border-focus: #4CAF50;
  --calc-btn-bg: #4CAF50;
  --calc-btn-bg-hover: #45a049;
  --calc-btn-bg-copied: #2196F3;
  --calc-btn-bg-copied-hover: #1565c0;
}

body.dark-mode {
  --calc-bg: #23272b;
  --calc-text: #fff;
  --calc-title: #fff;
  --calc-label: #e0e0e0;
  --calc-input-bg: #181a1b;
  --calc-input-border: #444;
  --calc-input-border-focus: #90ee90;
  --calc-btn-bg: #2196F3;
  --calc-btn-bg-hover: #1565c0;
  --calc-btn-bg-copied: #2196F3;
  --calc-btn-bg-copied-hover: #1565c0;
}

.tva-calculette-container {
    width: 100%;
    max-width: 500px;
    margin: 30px auto;
    padding: 20px;
    background: var(--calc-bg);
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    color: var(--calc-text);
}
.tva-calculette-container h2 {
    text-align: center;
    color: var(--calc-title);
    margin-bottom: 30px;
    font-size: 2rem;
}
.tva-calculette-container .calculator {
    padding: 0;
}
.tva-calculette-container .input-group {
    margin-bottom: 20px;
    position: relative;
}
.tva-calculette-container .input-with-copy {
    position: relative;
    width: 100%;
}
.tva-calculette-container .input-with-copy input {
    width: 100%;
    padding: 12px;
    padding-right: 100px;
    border: 2px solid var(--calc-input-border);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
    box-sizing: border-box;
    background-color: var(--calc-input-bg);
    color: var(--calc-text);
}
.tva-calculette-container .input-with-copy input:focus {
    outline: none;
    border-color: var(--calc-input-border-focus);
}
.tva-calculette-container .input-with-copy .copy-btn {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background-color: var(--calc-btn-bg);
    color: #fff;
    border: none;
    border-radius: 4px;
    padding: 6px 16px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
    z-index: 2;
    width: 100px;
}
.tva-calculette-container .input-with-copy .copy-btn:hover,
.tva-calculette-container .result-item .copy-btn:hover {
    background-color: var(--calc-btn-bg-hover);
}
.tva-calculette-container .input-with-copy .copy-btn.copied,
.tva-calculette-container .result-item .copy-btn.copied {
    background-color: var(--calc-btn-bg-copied);
}
.tva-calculette-container .input-with-copy .copy-btn.copied:hover,
.tva-calculette-container .result-item .copy-btn.copied:hover {
    background-color: var(--calc-btn-bg-copied-hover);
}
.tva-calculette-container .tva-group {
    margin-bottom: 20px;
}
.tva-calculette-container .tva-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--calc-input-border);
    border-radius: 8px;
    font-size: 1rem;
    background-color: var(--calc-input-bg);
    color: var(--calc-text);
    cursor: pointer;
    transition: border-color 0.3s ease;
}
.tva-calculette-container .tva-group select:focus {
    outline: none;
    border-color: var(--calc-input-border-focus);
}
.tva-calculette-container label {
    display: block;
    margin-bottom: 8px;
    color: var(--calc-label);
    font-weight: 500;
}
.tva-calculette-container .results {
    margin-top: 30px;
    border-top: 1px solid var(--calc-input-border);
    padding-top: 20px;
}
.tva-calculette-container .result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    color: var(--calc-label);
    gap: 20px;
}
.tva-calculette-container .result-item span:first-child {
    flex-shrink: 0;
}
.tva-calculette-container .result-item span:last-child {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--calc-label);
    font-weight: bold;
    flex-wrap: wrap;
}
.tva-calculette-container .montant {
    display: flex;
    flex-direction: row;
    align-items: center;
    min-width: 0;
    flex: 1;
    gap: 0.3em;
}
.tva-calculette-container .montant .valeur {
    font-size: 2rem;
    line-height: 1;
}
.tva-calculette-container .montant .euro {
    font-size: 1.2rem;
    line-height: 1;
}
.tva-calculette-container .result-item .copy-btn {
    background-color: var(--calc-btn-bg);
    color: #fff;
    border: none;
    border-radius: 4px;
    padding: 6px 16px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
    margin-left: 10px;
    z-index: 2;
}
.tva-calculette-container input.form-control {
    padding: .375rem 2.25rem .375rem .75rem;
}
.tva-calculette-container .input-group input[type="number"],
.tva-calculette-container .input-group input.form-control {
    padding-right: 10px;
}
@media (max-width: 600px) {
    .tva-calculette-container {
        padding: 10px;
    }
    .tva-calculette-container .calculator {
        padding: 0;
    }
    .tva-calculette-container h2 {
        font-size: 1.3rem;
    }
    .tva-calculette-container .montant .valeur {
        font-size: 1.2rem;
    }
    .tva-calculette-container .input-with-copy .copy-btn,
    .tva-calculette-container .result-item .copy-btn {
        padding: 6px 8px;
        font-size: 0.85rem;
        width: 70px;
    }
}