:root {
    --primary: #4361ee;
    --secondary: #3f37c9;
    --accent: #4895ef;
    --success: #4cc9f0;
    --danger: #f72585;
    --warning: #f8961e;
    --light: #f8f9fa;
    --dark: #212529;
    --white: #ffffff;
    --gray: #6c757d;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--dark);
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 20px auto;
    background-color: var(--white);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

h1 {
    color: var(--primary);
    text-align: center;
    margin-bottom: 30px;
    font-size: 2.2rem;
    font-weight: 700;
    background: linear-gradient(to right, var(--white), var(--light));
    
    position: relative;
    padding-bottom: 10px;
}

h1::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(to right, var(--primary), var(--accent));
    border-radius: 2px;
}

h2 {
    color: var(--secondary);
    margin-top: 0;
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 15px;
}

.input-group {
    position: relative;
    margin-bottom: 25px;
}

input[type="text"] {
    width: 100%;
    padding: 15px 20px;
    margin: 10px 0;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    transition: all 0.3s;
    background-color: var(--light);
}

input[type="text"]:focus {
    border-color: var(--accent);
    outline: none;
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
    background-color: var(--white);
}

input[type="text"]::placeholder {
    color: var(--gray);
    opacity: 0.7;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary);
    color: var(--white);
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn:hover:not(:disabled) {
    background-color: var(--secondary);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.btn:active:not(:disabled) {
    transform: translateY(0);
}

.btn:disabled {
    background-color: var(--gray);
    cursor: not-allowed;
    opacity: 0.7;
}

.btn i {
    margin-right: 8px;
}

.btn-success {
    background-color: var(--success);
}

.btn-success:hover:not(:disabled) {
    background-color: #3aa8d8;
}

.btn-warning {
    background-color: var(--warning);
}

.btn-warning:hover:not(:disabled) {
    background-color: #e68a19;
}

.button-group {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
    margin-top: 30px;
}

table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 25px 0;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.05);
}

th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

th {
    background-color: var(--primary);
    color: var(--white);
    font-weight: 500;
    position: sticky;
    top: 0;
}

tr:nth-child(even) {
    background-color: rgba(67, 97, 238, 0.05);
}

tr:hover {
    background-color: rgba(67, 97, 238, 0.1);
}

select {
    width: 100%;
    padding: 10px;
    border-radius: 6px;
    border: 2px solid #e0e0e0;
    background-color: var(--light);
    font-family: 'Poppins', sans-serif;
    transition: all 0.3s;
}

select:focus {
    border-color: var(--accent);
    outline: none;
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.2);
}

select:disabled {
    background-color: #e9ecef;
    cursor: not-allowed;
    opacity: 0.8;
    border-color: #ced4da;
}

select:disabled option {
    color: #6c757d;
}

#score-display {
    color: var(--success);
    font-weight: bold;
    background-color: rgba(76, 201, 240, 0.1);
    padding: 5px 10px;
    border-radius: 20px;
    margin-left: 10px;
    font-size: 0.9em;
}

.correct {
    color: var(--success);
    font-weight: bold;
}

.incorrect {
    color: var(--danger);
    font-weight: bold;
}

.verification-cell {
    text-align: center;
    font-weight: bold;
}

.feedback-message {
    margin: 20px 0;
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.positive-feedback {
    background-color: rgba(76, 201, 240, 0.2);
    color: var(--success);
    border-left: 4px solid var(--success);
}

.negative-feedback {
    background-color: rgba(247, 37, 133, 0.1);
    color: var(--danger);
    border-left: 4px solid var(--danger);
}

sup {
    font-size: 0.8em;
    vertical-align: super;
}

td sup {
    font-size: 0.7em;
}

.login-container {
    text-align: center;
    padding: 40px 20px;
    max-width: 500px;
    margin: 0 auto;
}

.login-icon {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 20px;
}

/* Estilos para móviles */
@media (max-width: 768px) {
    .container {
        padding: 20px;
        margin: 10px auto;
        border-radius: 10px;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    h2 {
        font-size: 1.3rem;
    }
    
    table {
        display: block;
        overflow-x: auto;
    }
    
    .button-group {
        flex-direction: column;
        gap: 10px;
    }
    
    .btn {
        width: 100%;
    }
    
    th, td {
        padding: 10px 8px;
        font-size: 0.9rem;
    }
    
    input[type="text"], select {
        padding: 12px 15px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    
    .container {
        padding: 15px;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    h2 {
        font-size: 1.2rem;
    }
    
    .login-icon {
        font-size: 2.5rem;
    }
}

/* Animaciones adicionales */
@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.pulse {
    animation: pulse 1.5s infinite;
}

/* Efecto de carga */
.loading {
    position: relative;
    overflow: hidden;
}

.loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.5), transparent);
    animation: loading 1.5s infinite;
}

@keyframes loading {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

@keyframes confetti-fall {
    to {
        transform: translateY(100vh) rotate(360deg);
    }
}