:root {
    --primary-color: #6f42c1;
    --primary-dark: #5f28d6;
    --secondary-color: #8a63d2;
    --light-bg: #f8f9fa;
    --dark-text: #2b2d42;
    --light-text: #6c757d;
    --success-color: #4bb543;
    --error-color: #e63946;
    --border-radius: 12px;
    --box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease;
}
.fractions {
    padding: 40px;
    width: 100%;
}
.header {
    text-align: center;
    margin-bottom: 30px;
}
.header h1 {
    color: var(--dark-text);
    font-size: 28px;
    margin-bottom: 8px;
    font-weight: 700;
}
.header p {
    color: var(--light-text);
    font-size: 16px;
}
.explanation {
    background-color: var(--light-bg);
    padding: 18px;
    border-radius: var(--border-radius);
    font-size: 15px;
    color: var(--light-text);
    margin-bottom: 30px;
    line-height: 1.6;
    border-left: 4px solid var(--primary-color);
}
.fraction-form {
    display: flex;
    flex-direction: column;
    gap: 25px;
    /* margin-bottom: 2rem; */
}
.fraction-input-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}
.fraction-input {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    width: 100%;
}
.fraction-input input {
    padding: 16px;
    font-size: 20px;
    text-align: center;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    transition: var(--transition);
    width: 100%;
    max-width: 200px;
    font-weight: 600;
    color: var(--dark-text);
    background-color: #f8f9fa;
}
.fraction-input input:focus {
    border-color: var(--primary-color);
    outline: none;
    background-color: white;
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}
.fraction-input input::placeholder {
    color: #adb5bd;
    font-weight: normal;
}
.fraction-bar {
    width: 80px;
    height: 3px;
    background-color: var(--dark-text);
    margin: 12px 0;
    border-radius: 2px;
}
.input-labels {
    display: flex;
    justify-content: space-between;
    width: 100%;
    max-width: 200px;
    margin-top: 8px;
}
.label {
    font-size: 13px;
    color: var(--light-text);
    font-weight: 500;
}
.btn-submit-fraction {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    padding: 16px 24px;
    font-size: 17px;
    font-weight: 600;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(67, 97, 238, 0.3);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}
.btn-submit-fraction:hover {
    background: linear-gradient(135deg, var(--primary-dark), #6511a8);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(67, 97, 238, 0.4);
}
.btn-submit-fraction:active {
    transform: translateY(0);
}
.btn-submit-fraction svg {
    width: 18px;
    height: 18px;
}
.message-error {
    color: var(--error-color);
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    margin-top: 5px;
    min-height: 20px;
}
.result-card {
    /* margin-top: 25px; */
    padding: 25px;
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    border-radius: var(--border-radius);
    border: 1px solid #e9ecef;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--dark-text);
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    text-align: center;
    transition: var(--transition);
    display: none;
}
.result-card.show {
    /* display: block; */
    display: flex;
    flex-direction: column;
    justify-content: center;
    animation: fadeIn 0.5s ease;
}
.container-fraction-user{
    display: flex;
    flex-direction: row;
    align-items: center;
}
.equal{
    margin: 0 1rem;
    /* padding-top: 26px; */
}
.result-card.success {
    border-left: 4px solid var(--success-color);
}
.result-fraction {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
}
.result-content{
    display: flex;
    justify-content: center;
}
.result-fraction span, .fraction-user span {
    font-size: 24px;
    font-weight: 700;
}
.result-fraction .fraction-bar {
    margin: 8px 0;
}
.result-explanation {
    font-size: 15px;
    font-weight: normal;
    color: var(--light-text);
    margin-bottom: 15px;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
@media (max-width: 480px) {
    .fractions {
        padding: 25px;
    }
    
    .header h1 {
        font-size: 24px;
    }
    
    .fraction-input input {
        font-size: 18px;
        padding: 14px;
    }
}