.role-card {
    transition: all 0.3s ease;
    border: 2px solid #e9ecef;
    cursor: pointer;
}

    .role-card:hover {
        border-color: #007bff;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        transform: translateY(-2px);
    }

    .role-card.selected-student {
        border-color: #007bff;
        background-color: rgba(0, 123, 255, 0.05);
        box-shadow: 0 4px 12px rgba(0, 123, 255, 0.2);
    }

    .role-card.selected-teacher {
        border-color: #28a745;
        background-color: rgba(40, 167, 69, 0.05);
        box-shadow: 0 4px 12px rgba(40, 167, 69, 0.2);
    }

.role-radio {
    display: none;
}

.role-specific-fields {
    border-left: 4px solid #007bff;
    padding-left: 15px;
    margin-left: 10px;
    margin-top: 20px;
    background-color: #f8f9fa;
    border-radius: 0 8px 8px 0;
    padding: 20px;
}

    .role-specific-fields.teacher-fields {
        border-left-color: #28a745;
    }

.role-specific-fields {
    animation: slideIn 0.3s ease-in-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

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

.form-label {
    font-weight: 600;
    color: #495057;
}

    .form-label i {
        margin-right: 5px;
        color: #6c757d;
    }

    .form-label .required {
        color: #dc3545;
    }

.phone-input-container {
    position: relative;
}

    .phone-input-container .form-control {
        padding-left: 45px;
    }

    .phone-input-container::before {
        content: "🇷🇺";
        position: absolute;
        left: 12px;
        top: 18px;
        transform: translateY(-50%);
        z-index: 10;
        font-size: 1.2em;
    }

    .phone-input-container .text-danger {
        display: block;
        margin-top: 0.25rem;
    }

.registration-card {
    border: none;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    border-radius: 12px;
    overflow: hidden;
}

    .registration-card .card-header {
        background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
        border: none;
        padding: 20px;
    }

.btn-register {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
    border: none;
    padding: 12px 30px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
}

    .btn-register:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 20px rgba(40, 167, 69, 0.3);
    }

.alert-role-info {
    border: none;
    border-radius: 8px;
    padding: 15px 20px;
    margin-bottom: 20px;
}

    .alert-role-info.student-alert {
        background-color: rgba(0, 123, 255, 0.1);
        color: #004085;
        border-left: 4px solid #007bff;
    }

    .alert-role-info.teacher-alert {
        background-color: rgba(255, 193, 7, 0.1);
        color: #856404;
        border-left: 4px solid #ffc107;
    }

.form-control::placeholder,
.form-select::placeholder,
textarea::placeholder {
    font-size: 0.875rem;
    color: #6c757d;
    opacity: 0.7;
}

@media (max-width: 768px) {
    .form-control::placeholder,
    .form-select::placeholder,
    textarea::placeholder {
        font-size: 0.8rem;
    }

    .role-card {
        margin-bottom: 15px;
    }

    .role-specific-fields {
        margin-left: 0;
        border-left: none;
        border-top: 4px solid #007bff;
        border-radius: 8px;
    }

        .role-specific-fields.teacher-fields {
            border-top-color: #28a745;
        }
}

.is-invalid {
    border-color: #dc3545;
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-5px);
    }

    75% {
        transform: translateX(5px);
    }
}

.is-valid {
    border-color: #28a745;
}

.form-text {
    font-size: 0.875rem;
    color: #6c757d;
    margin-top: 5px;
}

    .form-text i {
        margin-right: 5px;
    }