.wrapper {
    flex: 1 0 auto;
    width: 100%;
    display: flex;
    justify-content: center;
    padding: 20px 0; 
}

.container {
    background-color: var(--card-background);
    border-radius: 16px;
    box-shadow: 0 10px 25px -5px var(--shadow-color), 0 10px 10px -5px var(--shadow-color);
    padding: 30px 40px;
    width: 100%;
    max-width: 660px;
    height: fit-content;
    border: 1px solid var(--border-color);
    margin: 20px 0;
}

.header {
    text-align: center;
    margin-bottom: 35px;
}

.header h1 {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.header p {
    font-size: 1.125rem;
    color: var(--subtle-text-color);
}

.tabs {
    display: flex;
    margin-bottom: 30px;
    background-color: #F7FAFC;
    border-radius: 10px;
    padding: 4px;
    flex-wrap: wrap;
}

.tab {
    padding: 12px 16px;
    text-align: center;
    background: transparent;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--subtle-text-color);
    font-size: 0.8rem;
    width: calc(100% / 3);
}

.tab.active {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 2px 4px rgba(90, 103, 216, 0.25);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease-out;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-color);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 16px;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    background-color: #F7FAFC;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23131313%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
    background-repeat: no-repeat;
    background-position: right 1.2rem top 50%;
    background-size: 0.65rem auto;
}

.form-group input::placeholder {
    color: #A0AEC0;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(90, 103, 216, 0.2);
    background-color: #fff;
}

.btn-convert {
    width: 100%;
    padding: 18px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 40px;
}

.btn-convert:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 7px 20px rgba(90, 103, 216, 0.25);
}

.btn-convert:active:not(:disabled) {
    transform: translateY(-1px);
}

.btn-convert:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.result {
    margin-top: 30px;
    padding: 25px;
    border-radius: 12px;
    display: none;
    animation: slideUp 0.5s ease-out;
    border: 1px solid transparent;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(15px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result.success {
    background-color: #F0FFF4;
    border-color: #9AE6B4;
    color: #2F855A;
}

.result.error {
    background-color: #FFF5F5;
    border-color: #FEB2B2;
    color: #C53030;
    text-align: center;
}

.result h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.result.error h3::before {
    content: '✗';
    margin-right: 10px;
    font-weight: bold;
}

.score-display {
    font-size: 2.5rem;
    font-weight: 800;
    text-align: center;
    margin: 20px 0;
    color: var(--primary-color);
}

.result p {
    font-size: 1rem;
    line-height: 1.6;
    text-align: center;
}

.loading {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 25px;
        margin: 15px;
    }

    .header h1 {
        font-size: 1.8rem;
    }

    .header p {
        font-size: 1rem;
    }

    .tabs {
        flex-direction: column;
        gap: 4px;
    }
    .tab{
        width: 100%;
    }
}