.wva-calculator-container {
    max-width: 500px;
    margin: 20px auto;
    padding: 25px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #fff;
}

.wva-calculator-container h3 {
    text-align: center;
    margin-bottom: 20px;
    font-size: 1.5em;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
}

.wva-tabs {
    display: flex;
    margin-bottom: 20px;
    background: rgba(255,255,255,0.1);
    border-radius: 10px;
    overflow: hidden;
}

.wva-tab {
    flex: 1;
    padding: 12px;
    border: none;
    background: transparent;
    color: rgba(255,255,255,0.7);
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    font-size: 0.9em;
}

.wva-tab:hover {
    background: rgba(255,255,255,0.1);
    color: #fff;
}

.wva-tab.active {
    background: rgba(255,255,255,0.25);
    color: #fff;
}

.wva-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.wva-panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.wva-form-group {
    margin-bottom: 15px;
}

.wva-form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    font-size: 0.95em;
}

.wva-form-group input {
    width: 100%;
    padding: 12px 15px;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    background: rgba(255,255,255,0.9);
    color: #333;
    box-sizing: border-box;
    transition: box-shadow 0.3s ease;
}

.wva-form-group input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255,255,255,0.3);
}

.wva-btn {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: 8px;
    background: #ff6b6b;
    color: #fff;
    font-size: 1.1em;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 5px;
}

.wva-btn:hover {
    background: #ee5a5a;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.wva-result {
    margin-top: 15px;
    padding: 15px;
    background: rgba(255,255,255,0.15);
    border-radius: 8px;
    text-align: center;
    font-size: 1.2em;
    font-weight: 700;
    min-height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.wva-result.success {
    background: rgba(46, 204, 113, 0.3);
    border: 1px solid rgba(46, 204, 113, 0.5);
}

.wva-result.error {
    background: rgba(231, 76, 60, 0.3);
    border: 1px solid rgba(231, 76, 60, 0.5);
}

.wva-info {
    margin-top: 20px;
    padding: 15px;
    background: rgba(0,0,0,0.2);
    border-radius: 8px;
    font-size: 0.9em;
}

.wva-info p {
    margin: 0 0 10px 0;
    font-weight: 600;
}

.wva-info ul {
    margin: 0;
    padding-left: 20px;
}

.wva-info li {
    margin-bottom: 5px;
}

@media (max-width: 480px) {
    .wva-calculator-container {
        padding: 15px;
        margin: 10px;
    }
    
    .wva-tabs {
        flex-direction: column;
    }
}