:root {
    --primary-color: #4361ee;
    --primary-light: #4895ef;
    --primary-dark: #3a0ca3;
    --secondary-color: #f72585;
    --accent-color: #4cc9f0;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --success-color: #38b000;
    --warning-color: #ffaa00;
    --error-color: #ef233c;
    --border-radius: 12px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Quicksand', sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    color: var(--dark-color);
}

.container {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 2rem;
    width: 90%;
    max-width: 500px;
    text-align: center;
    transition: all 0.3s ease;
}

.screen {
    transition: all 0.3s ease;
}

.hidden {
    display: none;
}

.logo {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

h1 {
    color: var(--primary-dark);
    margin-bottom: 1.5rem;
    font-weight: 700;
}

input[type="text"], input[type="number"] {
    padding: 12px 15px;
    margin: 10px 0;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    width: 80%;
    max-width: 300px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

input[type="text"]:focus, input[type="number"]:focus {
    outline: none;
    border-color: var(--primary-light);
}

button {
    border: none;
    padding: 12px 24px;
    margin: 10px 5px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s;
}

.primary-btn {
    background-color: var(--primary-color);
    color: white;
}

.primary-btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
}

.secondary-btn {
    background-color: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.secondary-btn:hover {
    background-color: #f8f9fa;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
}

.fraction-container {
    margin: 0.3rem 0;
    padding: 0.2rem;
    background-color: rgba(67, 97, 238, 0.05);
    border-radius: var(--border-radius);
    display: inline-block;
    box-shadow: var(--box-shadow);
}

.fraction {
    display: inline-block;
    text-align: center;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-dark);
}

.numerator, .denominator {
    padding: 5px 20px;
}

.fraction-line {
    border-top: 2px solid var(--primary-dark);
    margin: 8px 0;
}

.input-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0.5rem 0;
}

.message {
    min-height: 30px;
    margin: 1.5rem 0;
    font-weight: 600;
    font-size: 1.1rem;
    padding: 10px 15px;
    border-radius: var(--border-radius);
}

.correct {
    color: var(--success-color);
    background-color: rgba(56, 176, 0, 0.1);
}

.incorrect {
    color: var(--error-color);
    background-color: rgba(239, 35, 60, 0.1);
}

.info {
    color: var(--warning-color);
    background-color: rgba(255, 170, 0, 0.1);
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.score-container {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-dark);
    background-color: rgba(67, 97, 238, 0.1);
    padding: 8px 16px;
    border-radius: 50px;
}

.score-icon {
    font-size: 1.2rem;
}

.instruction {
    font-size: 1.2rem;
    color: var(--dark-color);
    margin-bottom: 1rem;
}

.fraction-input {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    margin: 0 10px;
    width: 100px;
}

.numerator-input, .denominator-input {
    width: 60px;
    text-align: center;
    padding: 10px;
    font-size: 1.2rem;
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    font-weight: 600;
    color: var(--primary-dark);
}

.fraction-input .fraction-line {
    width: 100%;
    height: 2px;
    background-color: var(--primary-dark);
    margin: 5px 0;
}

.buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 1.5rem;
}

button:disabled {
    background-color: #adb5bd;
    color: #6c757d;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

input:disabled {
    background-color: #e9ecef;
    color: #6c757d;
    cursor: not-allowed;
}

@media (max-width: 600px) {
    .container {
        padding: 1.5rem;
        width: 100%;
        min-height: 100vh;
        border-radius: 0;
    }

    h1 {
        font-size: 1.5rem;
    }

    .buttons {
        flex-direction: column;
        gap: 10px;
    }

    button {
        width: 100%;
        margin: 5px 0;
    }

    .fraction {
        font-size: 1.8rem;
    }

    .numerator-input, .denominator-input {
        width: 50px;
        font-size: 1.1rem;
    }

    .fraction-input {
        width: 70px;
    }

    input[type="text"], input[type="number"] {
        width: 90%;
    }
}

/* Animaciones */
@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {transform: translateY(0);}
    40% {transform: translateY(-10px);}
    60% {transform: translateY(-5px);}
}

.bounce {
    animation: bounce 0.6s;
}

@keyframes shake {
    0%, 100% {transform: translateX(0);}
    20%, 60% {transform: translateX(-5px);}
    40%, 80% {transform: translateX(5px);}
}

.shake {
    animation: shake 0.4s;
}